Awesome list of apps and tools for Ubuntu/Linux

Impressive list of applications and tools for Ubuntu / Linux is a huge list of applications, software, tools and other materials for Linux that have all been tested on Ubuntu, probably many of them can work in your favorite distribution.

Many of these applications have been discussed here in DesdeLinux, Others we have just met and others have simply not been able to write detailed articles on these applications, but from today we commit ourselves to writing about them. This list will be constantly updated, adding the applications that you recommend us and some others that we are able to test and recommend.

Applications for Ubuntu / Linux

Audio Applications for Ubuntu / Linux

Air time: It is an open transmission software for programming and managing remote stations.
Ardor: It allows recording, editing and mixing on Linux. You can read more about Ardor in:

Top 5 Free Applications for Music Production
Ardor 3, the best free DAW to date, available for download
Ardor 3: Introduction
Ardor 3 - 16-track drum template

Audacious: It is an open source audio player, it allows you to play your music without consuming many resources on your computer.
You can read more about Audacious in:

Audacious: Music with Style
Audacious 2.3 is out

Audacity: It is a free, multiplatform and open source software that allows you to record and edit audios.
You can read more about Audacity in:

Top 5 Free Applications for Music Production
Audacity and the TBRGs
Improve (a bit) the appearance of Audacity

Audio recorder: It is a simple audio recorder that is available in Ubuntu PPA.
Clementines: Play various audio formats without loss of quality. You can read more about Clementine in:

Clementine 1.0 arrives!
Clementine 1.0 and its global search
Clementine: Solid Alternative to Amarok
How to set Clementine as your favorite music player in Ubuntu
Install Clementine 1.2, with new improvements and changes!
Cantata vs Amarok vs Clementine, Heavyweight Battle
Fix Clementine's appearance on Ubuntu 14.04

Google Play Music Download Player: Cross-platform unofficial Desktop client to play music from GooglePlayMusic.
Hydrogen: It is an advanced drum machine for GNU / Linux.
KXStudio: It is a collection of applications and plugins for professional audio production.
K3b: It is a complete graphical tool to burn CD / DVD and it is optimized for KDE.
Kid3Qt: Allows you to manage and tag your music, for example, the artist, album, year and genre of all MP3 files in an album.
Let's make music: Allows you to make music on your computer by creating melodies and rhythms, you can synthesize and mix sounds, as well as organize samples and many other features.
Mixxx: An open source DJ tool, providing everything you need for live mixing, an excellent alternative to Tractor.
You can read more about Mixxx in:

Mixxx 2.0: Mix tracks in the best DJ style

soundjuicer: It is a tool that allows you to extract audio tracks, in the same way, it has a cloner and CD player.
Tomahawk: An excellent player that allows you to play streaming, downloaded music, music in the cloud ( SoundCloud, Spotify, Beats, YouTube among others), playlists, radio stations and more. It also has integration with social networks, in addition to allowing us to connect with other people through Gtalk and Jabber.

Chat Clients for Ubuntu / Linux

ghetto skype: Open source Chat client for Skype.
HexChat: It is an IRC client based on X-Chat, but unlike X-Chat it is completely free for Windows and Unix-like systems.
Messenger for Desktop: It is an application for Facebook messenger.
Pidgin: The universal chat client. You can read more about Pidgin in:

Pidgin + KWallet
Facebook chat on Pidgin & Empathy without special plugins
Great icons for the Pidgin tray
Extension to integrate Pidgin in Gnome-Shell
Nice icon theme for Pidgin inspired by Adium
My experience with Prosody and Pidgin
How to integrate Pidgin notifications with KDE notifications
How to use Bonjour on Pidgin with Arch Linux?
How to connect to Facebook with Pidgin
How to use WhatsApp on Linux with Pidgin
How to connect Hangouts to Pidgin when your company won't let you?
Install HipChat or use HipChat chat from Pidgin
Use the Chat "Line" protocol in Pidgin for Linux Mint 17 Qiana
HowTo: Connect to Facebook chat with Pidgin (again)

scudcloud: A Slack client for Linux.
Slack-Gitsin: A client to use Slack from the console. You can read more about Slack-Gitsin in:

How to use Slack from the console with Slack-Gitsin

Skype or Whatsapp: Official Skype Client for Linux, the tool that allows you to communicate for free.
Telegram: A messaging application focused on speed and security, it is super fast, simple and free.
You can read more about Telegram in:

Telegram and Ello as safe alternatives in social networks
Mega Chat and Telegram, why do we need Hangouts or WhatsApp?
Using Telegram from the terminal
[Python] Post to social networks from Telegram.
Tips to install Popcorn Time, Spotify and Telegram on DEBIAN

Viber: Viber for Linux allows you to send free messages and make free calls to other Viber users from any country.
whatsie: Unofficial chat client for WhatsApp
French: Chat client that currently allows us to integrate WhatsApp, Slack, WeChat, HipChat, Facebook Messenger, Telegram, Google Hangouts, GroupMe, Skype for example, among others.

Data backup and recovery applications for Ubuntu / Linux

BorgBackup: A good tool for backup.
Photorec: It is a data recovery software designed to recover lost files, including video, images, documents and files from hard drives, CD-ROMs, and digital cameras. You can read more about Photorec in:

Recover deleted files easily with Photorec from the console

qt4-fsarchiver: It is a graphical interface for the program fsarchiver It allows saving / restoring partitions, folders and MBR / GPT. The program is for Debian, Suse and Fedora based systems.
System Rescue CD: It is a GNU / Linux rescue disk, available to be used as a bootable CD-ROM or USB, with the purpose of managing or repairing a system, it also allows data recovery. You can read more about System Rescue CD in:

SystemRescueCd 1.5.2 came out, distro to repair your system
SystemRescue CD v2.4.0 Released

Test disk: It is a powerful free data recovery software. It was designed primarily to help recover lost partitions and / or convert non-bootable disks to bootable disks when these symptoms are caused by faulty software.

Applications and Tools for Ubuntu / Linux desktop customization

Arc Theme: A flat theme with transparent elements
Compiz Config settings manager: This 3D Desktop Project brings visual effects that improve the ease of use of the system and provide higher productivity.
Conky: It is a lightweight system monitor, which displays any type of information on your desktop.
flatabulous: This is a Flat theme for Ubuntu and other Gnome-based GNU / Linux distributions.
Flatabulous Arc Theme: My favorite theme for Ubuntu.
Radiance Theme: A theme inspired by OSX Yosemite based on Radiance.
Gnome Extensions: Extensions for the Gnome desktop.
Numix Icon Theme: One of the best icon themes for linux ubuntu.
Numix Theme: A good topic and very popular.
Papyrus Icon Theme: One of the best icon themes for linux ubuntu.
Unity Tweak Tool: A must-have application for ubuntu customization.
yosembiance theme: A Unity theme inspired by OSX Yosemite based on Ambiance.

Desktop environments for Ubuntu / Linux

cinnamon: The desktop environment cinnamon.
You can read more about cinnamon in:

Cinammon 1.2 available, with stationery and more

Gnome: The desktop environment Gnome. You can read more about Gnome in:

What's New in Gnome 3.20
How to write a KDE application and a GNOME application
Code points. How to insert characters in Gnomes
Enable one-touch click function on the Gnome touchpad
HowTo: Install Arc, a beautiful GTK theme in GNOME
Brief overview of GNOME 3.16
Headerbar: theme to integrate Firefox in Gnome
Install Gnome Classic (Flashback) on Ubuntu 14.10 / Linux Mint 17
Elementary Icon Pack in GNOME
Nitrux OS: Beautiful Icon Set for KDE and GNOME

KDE: The desktop environment KDE. You can read more about KDE in:

KDE Neon, Plasma 5.7 with a stable base
Give KDE a uniform appearance in your QT and GTK applications
Set up some effects in KDE to show off to your friends
Differentiate your folders in KDE by giving them a different color
Minimize any KDE application to the system tray
Emerald Icons: Best of Flattr and Breeze for KDE
Prelink (or how to make KDE boot in 3 seconds)

Mate: The desktop environment MATE is the continuation of GNOME 2. It provides an intuitive and attractive desktop environment. You can read more about MATE in:

Ubuntu MATE is already an official "flavor" of Ubuntu
Review: Ubuntu Mate Beta 2, a desktop for nostalgic people
[HowTo] Debian Testing + Mate + Programs
Available MATE 1.6 with many improvements
My Experience with Mate in Debian Testing

Unity: The desktop environment Unity. You can read more about Unity in:

Mir and Unity 8 will be present in Ubuntu 14.10
How to restart Unity in an emergency
Unity 6.8 incorporates performance improvements
Unity, the slowest in the class

Xfce: The desktop environment Xfce. You can read more about Xfce in:

News from XFCE !! What's new in Xfce 4.12?
Whisker Menu: adapt its appearance to our GTK theme in Xfce
XFCE Special: The Most Interesting Articles

Applications and Development Tools for Ubuntu / Linux

Android Studio: It is the official IDE for Android, provides the fastest tools for creating applications for various Android devices. You can read more about Android Studio in:

Characteristics and qualities of Android Studio
Android Studio (or ADT) in KDE without dying in the attempt

aptana: Aptana Studio takes advantage of the flexibility of Eclipse and focuses on a powerful web development engine.
Atom: An excellent text editor.
You can read more about Atom in:

Atom 1.0 available for download

Arduino IDE: It is an open source IDE that helps to write code for Arduino.
Bluej: It is a free development environment for Java designed for beginners, used by millions of people around the world.
Code :: Blocks: It is a free development environment for C, C ++ and Fortran, built to satisfy the most demanding needs of its users. It is designed to be very extensible and fully configurable.
CodeLite: It is an open source and cross-platform IDE for C, C ++, PHP and Node.js.
Eclipse: It is a famous IDE for Java, C / C ++ and PHP with many functionalities
Fritzing: It is a tool for free electronic design, this initiative makes electronics accessible to anyone.
You can read more about Fritzing in:

Fritzing: free electronic design tool

geany: It is a text editor developed in GTK, with the basic characteristics of an integrated development environment. It was developed to provide a small and fast IDE, which had only a few dependencies on other packages.
You can read more about geany in:

Quick Open, another plugin for Geany
Powering Python in Geany
Fritzing: free electronic design tool

Genymotion: It is a fairly complete Android emulator. You can read more about Genymotion in:

Genymotion: An Android Emulator for GNU / Linux

Go: It is a free and open source system, designed to quickly and efficiently handle all version control of small and large projects. You can read more about Go in:

Control your versions and program in group with Git and Gitorious
Starting a project with Git and Google Code
Quick guide to using Git
Tips: More than 100 commands for Git that you should know

IntelliJ IDEA: A powerful IDE for JAVA
KDevelop: It is a free and open source IDE, with many functionalities and extensible with plug-in for C / C ++ and other programming languages.
KomodoEdit: It is a free and open source IDE that supports multiple languages. You can read more about KomodoEdit in:

To program with Komodo-Edit

light table: It is a last generation code editor, which allows live coding.
MariaDB: One of the most popular database servers. Made by the original MySQL developers.
You can read more about MariaDB in:

MySQL to Maria DB: Quick Migration Guide for Debian
Archlinux and Slackware: Bye bye MySQL, hello MariaDB
Percona TokuDB: High Performance and High Volumes in MySQL / MariaDB for Linux

MonoDevelop: Cross-platform IDE for C #, C # and more -.
Nemiver: It is a C / C ++ debugger that integrates into the GNOME desktop environment.
Netbeans: It is an IDE that allows you to develop applications in Java, HTML5, JavaScript and Css quickly and easily.
NodeJS: It is a programming environment, based on the language javascript with an event-oriented architecture, ideal for asynchronous programming. Node, is based on the engine V8 of Google.
oh-my-zsh: A framework for managing zsh configuration.
You can read more about oh-my-zsh in:

Install zsh and customize it with Oh My Zsh

PyCharm: Powerful IDE for Python
PostgreSQL: It is a powerful and open source database system.
Postman: Create help for APIs quickly
QtCreator: A cross-platform integrated development environment (IDE), designed to facilitate the creation of connected devices, user interfaces and applications.
Rabbit VCS: It is a set of graphical tools designed to provide simple and direct access to version control systems.
Sublime Text: One of the best text editors I have tried and currently use. You can read more about Sublime Text in:

Sublime Text 2, a truly sublime code editor
Sublime Text 2: the best code editor available?
Brackets vs SublimeText3: Which one to choose?
How to install Sublime Text 3 in openSUSE

Swift: It is a general purpose programming language built using a modern approach to security patterns, performance and software design.
Ubuntu SDK: The official Ubuntu SDK. You can read more about Ubuntu SDK in:

Developing Applications for Ubuntu [QML]

VS Code: It is a lightweight yet powerful source code editor that runs on the desktop and is available for Windows, OS X, and Linux. It comes with built-in support for JavaScript, typescript, and Node.js, plus it has a rich ecosystem of extensions for other languages (C ++, C #, Python, PHP). You can read more about VS Code in:

Testing Visual Studio Code

zsh: A powerful command line shell.

E-Book Utilities for Ubuntu / Linux

Caliber: A software with a somewhat ugly interface, but powerful for managing and converting e-books.
You can read more about Caliber in:

Caliber: the best Open Source program for E-books administration
How to convert ebooks with Caliber

Evince: It is a document viewer for multiple document formats. The objective of Evince is to replace the multiple document viewers that exist on the GNOME desktop with a single simple application.
Foxit: Foxit Reader 8.0, Award Winner PDF reader.
FBReader: One of the most popular applications for eReader. You can read more about FBReader in:

FBReader: Lightweight reader for ebook files on Linux

Lucidor: It is a program for reading and managing electronic books. Lucidor supports e-books in the EPUB file format and catalogs in the OPDS format. You can read more about Lucidor in:

Lucidor, program to read e-books

MasterPDF editor: It is a convenient and elegant PDF editor for Linux.
MuPDF: A lightweight PDF reader with an XPS viewer.
You can read more about MuPDF in:

MuPDF: ultra-fast and lightweight PDF viewer
PDF reader that only consumes 3MB

Okular: It is a universal document viewer developed by KDE. Okular it is cross-platform.
Sigil: It is a multiplatform EPUB e-book editor.

Editors for Ubuntu / Linux

Atom: An excellent text editor.
Bluefish: It is a powerful editor aimed at programmers and web developers, with many options for writing web pages, scripts and programming code. You can read more about Bluefish in:

Bluefish 2.2.7 is released stable
Available for download Bluefish 2.2.2
Download and install Bluefish 2.2.0 on Debian and Ubuntu
Bluefish 2.2.0-2 comes to Debian Testing
Available Bluefish 2.2.0

brackets: A modern text editor for web design.
You can read more about brackets in:

Brackets 1.1 what's new after spending time?
Brackets vs SublimeText3: Which one to choose?
Brackets, an IDE for web development that promises
Install Brackets in ArchLinux manually

Emacs: A Text Editor, Free and Open Source, extensible, customizable and with many other features.
You can read more about Emacs in:

Emacs # 1
Vim and Emacs: All Quiet Up Front

geany: It is a text editor developed in GTK, with the basic characteristics of an integrated development environment. It was developed to provide a small and fast IDE, which had only a few dependencies on other packages.
Gedit: It is the text editor of GNOME. Although its goal is simplicity and ease of use, Gedit is a powerful general-purpose text editor. You can read more about Gedit in:

Gedit evolves to IDE
Gedit… for programmers

Kate: It is the advanced text editor of the project KDE SC, and compared to some of the similar applications in other Desktop Environments, it is almost like an IDE, full of options and functionalities. But beware, it is only a text editor.
You can read more about Kate in:

Kate Schemes: Changing KATE's Colors

light table: It is a last generation code editor, which allows live coding.
Sublime Text: One of the best text editors I have tried and currently use.
VS Code: It is a lightweight but powerful source code editor that runs on the desktop and is available for Windows, OS X and Linux. It comes with built-in support for JavaScript, typescript, and Node.js, plus it has a rich ecosystem of extensions for other languages (C ++, C #, Python, PHP).
Vim: It is an advanced text editor, which seeks to provide the power of the 'Vi' editor, with a more complete set of features.
You can read more about Vim in:

Using VIM: Basic Tutorial.
How to color syntax in VIM
The ultimate Vim setup
Terminal Friday: Thinking Vim [Some tips]

Education Apps and Tools for Ubuntu / Linux

BibleTime: It is a Bible study application made on the bookstore Sword y Qt.
Celestia: It is a space simulator that allows you to explore our universe in three dimensions.
chemtool: It is a small program to draw chemical structures in Linux.
Epoptes: It is a free and open source tool for the management of a computer laboratory and has monitoring functionalities.
gcompris: It is a high-quality educational software package consisting of numerous activities for children aged 2 to 10 years.
GNU Khata: Open source accounting software.
Idempier: Open source ERP, developed in java and technology SOGI. Idempier it has a large number of modules.
You can read more about Idempier in:

Idempiere, the Open Source Erp with OSGI technology

Google Earth: It is a virtual globe, map and geographic information program.
GPperiodic: It is an application of the periodic table for Linux.
ITalc: It is a powerful and didactic tool for teachers. It allows you to view and control other computers on the network in various ways.
You can read more about ITalc in:

iTALC: how to use free software in your school classroom

KDE Education Suite: Free Educational Software based on KDE technologies.
MAPLE: It is a mathematical software that combines the most powerful mathematics engine in the world, with an interface that makes it very easy to analyze, explore, visualize and solve mathematical problems.
MATLAB: The platform MATLAB it is optimized for solving engineering and scientific problems. MATLAB can run analysis of large data sets.
Maxima: It is a system for the manipulation of symbolic and numerical expressions, including differentiation, integration, Taylor series, Laplace transforms, ordinary differential equations, systems of linear equations, etc.
Moodle: It is a course management system for online learning.
OpenEuclide: It is a 2D geometry software.
OpenSIS: It is a software for school management.
Scratch: It is a software that allows you to program your own interactive stories, games and animations, you can also share your creations with others in the online community. Scratch is a great tool for teaching kids to code.
Stellarium: It is free software that allows people to simulate a planetarium on their own computer.
You can read more about Stellarium in:

Stellarium: looking at the sky
Stellarium 0.14.2 for lovers of astronomy

Tux4Kids: Tux4Kids develops high-quality software for children, with the aim of combining fun and learning in one irresistible package.

Email / Email Applications and Tools for Ubuntu / Linux

Evolution: It is a personal information management application that provides email, calendar and address functionalities.
Geary: It is an email application built into GNOME 3. It allows you to read and send email with a simple and modern interface. You can read more about Geary in:

Geary: New mail client [+ Installation on Debian]

mail nag: It is a daemon that checks the POP3 and IMAP servers for new emails.
Thunderbird: It is a free email application that is easy to configure, customize, and has many features. You can read more about Thunderbird in:

Thunderbird 45 is here
Backup Thunderbird and Firefox between Windows and Linux
Goodbye KMail, I'm coming back to Thunderbird
Changing the location of Thunderbird's profile and folders

wmail: Unofficial desktop client for Linux from Gmail and Google Inbox.

File managers for Ubuntu / Linux

7zip: Unzip zip files. You can read more about 7zip in:

Compress with 7zip to the maximum from Dolphin in KDE (Service Menu)

AngrySearch: Allows you to search on Linux, showing immediate results as you type.
Double commander: It is a file manager, cross-platform with two panels side by side. It is inspired by Total Commander and has some new ideas.
Marlin: It's a new ultra-light file browser. This browser was born together with the Elementary project and was designed to be simple, fast and easy to use. You can read more about Marlin in:

Giving Marlin a Chance
Install Marlin on Debian Testing
Marlin: an interesting alternative to Nautilus

Nautilus: It is a file manager designed to adjust to the design and behavior of the desktop Gnome, giving the user an easy way to navigate and manage their files. You can read more about Nautilus in:

Nautilus thoroughly
Encrypt information from Nautilus with Turbo-Secure
How to enable 2-panel view in Nautilus

Nemo: It is the file manager for the desktop environment Cinnamon.
QDirStat: It is a file manager with a graphical interface that allows you to view the files that occupy more free space on our disk.
Cleaning: A file explorer that integrates well into any desktop environment. Cleaning is text-based and developed in Python .
Synapse: The best application launcher on Linux. You can read more about Synapse in:

Synapse: a GNOME Do-style application launcher but much faster

Thunar: This is the default file manager for Xfce 4.6. It has been designed to be quick and easy to use.
You can read more about Thunar in:

Install Thunar 1.5.1 with tabs on Xubuntu 12.10 or 12.04
Thunar will have Eyelashes!
What Thunar has never had
Install Thunar 1.5.1 with tabs on Xubuntu 12.10 or 12.04

Games for Ubuntu / Linux

0 AD: It is a free and open source real-time strategy game for GNU / Linux set in ancient wars and similar to other games like Age of Empires, Empire Earth o Age of Mythology. You can read more about 0 AD in:

0 AD (Strategy Game on Linux)
0 AD Alpha 2, things get better
0 AD: a free clone of the Age of Empires
0 AD asks for help

civilization5: Sid Meier's Civilization is recognized as one of the best strategy franchises of all time.
cockatrice: It is an open source and multiplatform game that allows you to play cards over the network.
You can read more about cockatrice in:

Play Magic: the gathering on your PC, free with Cockatrice

Desura: It is a community-driven digital distribution service for gamers, putting the best games, mods and downloadable content from developers at their fingertips, ready to buy and play. You can read more about Desura in:

Desura is now OpenSource
How to install Desura (Steam for Linux)

GBrainy: It is a brain teaser game, which allows players to have fun and keep their brain trained.
Minecraft: It is a game about placing blocks and various adventures. Explore randomly generated worlds and build incredible things from the simplest of homes to the largest of castles. You can read more about Minecraft in:

[Linux Games: 3] Minecraft
Install Minecraft from PPA

PlayOnLinux: Play Windows games on Linux.
You can read more about PlayOnLinux in:

PlayOnLinux or how to play your favorite Windows games on Linux

Simutrans: It is a free and open source transport simulator.
You can read more about Simutrans in:

Simutrans: a Transport Tycoon-style game

Steam: It is an impressive gaming platform, which allows the execution of numerous games.
Wine (Acronym for "Wine Is Not an Emulator") is a compatibility layer capable of running Windows applications on various operating systems.
xonotic: A first person shooter, ultra-fast, which takes us to the times of the fps arena. It has a single player game mode, but its strength is the multiplayer mode is inspired by Unreal Tournament and Quake.
You can read more about xonotic in:

Xonotic, excellent multiplayer game for GNU / Linux

Graphics Applications and Tools for Ubuntu / Linux

after shot: A powerful alternative to Adobe Photoshop!
Agave: It is a very simple application for the GNOME desktop that allows you to generate a wide variety of color schemes starting from a single color.
Blender: It is a free and open source tool for the creation of 3D spaces, animations and illustrations. You can read more about Blender in:

Blender 2.76b: When it comes to 3D
Keyboard Combinations in Blender (Vol. I)
Down jackets: Argentinean animated film made with Blender
How to create 3D Spaceships with Blender and SpaceshipGenerator

cinemapaint: It is open source software for deep painting
Darktable: It is an open source application, with photographic workflow and RAW developer
digikam: It is an advanced digital photo management application for Linux. You can read more about digikam in:

DigiKam: Classify and organize your images in KDE

Photoxx: It is a free open source image editing and collection management program.
GIMP: It is a free distribution program for tasks such as photo retouching, image composition and image creation
Hugin: It is a free multiplatform alternative for creating panoramic images and high resolution, in addition to having endless tools for image editing. You can read more about Hugin in:

Hugin: create your best panoramic photo.

Inkscape: It is a multiplatform vector graphics editor, with a wide range of functions that make Inkscape a powerful tool and all this under a GPL license. You can read more about Inkscape in:

[Inkscape] Introduction to Inkscape
Inkscape 0.91 arrives loaded with news and fixes
Inkscape + KDE: modify your own system tray icons
Resources for learning how to work with Inkscape

Chalk: Open source software for digital artists, painters and illustrators You can read more about Chalk in:

Krita 2.8 with better support for Tablets
Create a new Konqi with Krita
Krita is a finalist in the Open Source Awards 2011
Helps accelerate the development of Krita

Luminance HDR: It is an open source application with a graphical user interface that aims to provide a workflow for HDR images.
Eye: A fast and beautiful image viewer.
OpenShot: It's a free, easy-to-use, feature-rich video editor for Linux. You can read more about OpenShot in:

The new OpenShot 2.0 update has been released
Openshot: Create a slideshow of our photos
Openshot has already been included in the Ubuntu repositories

Pinta: Pinta is free open source software for drawing and editing images.
You can read more about Pinta in:

Available Pint 1.2

Pitivi: It's a free video editor with a beautiful and intuitive user interface, a clean code base, and a great community.
Radiance: It is a set of programs for the analysis and visualization of the lighting of a design.
RawTherapee: A nice but little known photo editing application.
Shotwell: It is a photo manager for GNOME 3.
stop motion: It is a free software application for creating stop-motion animations. It helps you to capture and edit the animation frames and export them as a single file.
Xara Extreme: It is a powerful general purpose graphics program.

Internet Applications and Tools for Ubuntu / Linux

Anatine: A desktop client for Twitter with many customizations.
Brave: It is a nice and fast desktop browser for MacOS, Windows and Linux.
You can read more about Brave in:

How to navigate freely and safely using Brave

Chrome: One of the most popular web browsers with a large number of plugins / applications.
Chromium: It is an open source project that aims to build the most stable, secure, and fastest web browser for all users.
Firefox: One of the most popular web browsers with a large number of plugins / applications.
Tor: It is a free and open source web browser that helps you defend against web traffic analytics, a form of surveillance that threatens personal freedom and privacy.
Vivaldi: A new and advanced browser with a lot of customizations.
Yandex: Fast and efficient browser.

Productivity Applications and Tools for Ubuntu / Linux

ambient noise: An application that allows you to focus on your productivity, thanks to ambient music.
Autokey: It is a desktop automation application for Linux, allows you to manage scripts and phrases, and assign abbreviations and hotkeys to each of them
Basket Note Pads: This multipurpose application helps to easily take all kinds of notes.
Brightness: Brightness Indicator for ubuntu.
Speedcrunch - A high precision calculator.
California: A very complete Calendar application that uses natural language to create events.
Copyq: It is an advanced clipboard manager with editing and scripting functions.
F.lux: Automatically adjusts the computer screen to match the lighting.
gnome dictionary: A powerful dictionary for Gnome.
Go for it: It is a simple and elegant productivity application, which offers a to-do list, is merged with a timer that keeps your focus on the current task.
My everything: A simple to-do list manager.
My Weather Indicator: Weather indicator for Ubuntu.
Notes: A simple note-taking application on Linux.
notepadqq: It is an alternative to the Notepad ++ note editor.
Plank: Plank is destined to be the simplest application dock on the planet.
knobDoneApp: It's the easiest way to keep track of your workflow using the Pomodoro technique, on top of your current task management service.
Papyrus: It is a different note manager that focuses on security, better user interface. Papyrus are trying to provide an easy to use and smart user interface for the users.
Recent Notice: A recent notification indicator.
Redshift: Tool that allows you to adjust the lighting of your screen according to the temperature, time and climate of your environment. This can help your eyes hurt less if you are working in front of the screen at night.
Shutter: It is a screen capture program with many extra features.
Simplenotote: It is an application to take notes from various platforms. It is a competitor to Evernote.
springseed: A simple and beautiful application for daily note taking.
sticky note: Sticky for your favorite desktop.
All.txt: An excellent Editor for managing and writing down daily tasks.
T: Unofficial Todoist client, task management platform, great user interface and has some optional premium features.
undistract me: Notifies when long duration commands have been completed.
Xmind: Mind mapping tool.
WPS Office: One of the best suite of office applications for Linux.
Zim: A graphical text editor used to maintain a collection of wiki pages, ideal for documents. Stored in plain text files for easy version control.

Applications and Security Tools for Ubuntu / Linux

ClamAV: It is an open source antivirus engine for the detection of Trojans, viruses, malware and other malicious threats.
GnuPG: It allows you to encrypt and sign your data and messages, it has a versatile key management system, as well as access modules for all types of public key directories.
Gufw: One of the easiest firewalls in the Linux world.
OpenSSH: OpenSSH Secure Shell server and client
Seahorse: GNOME interface for GnuPG
tcpdump: TCP Capture and Debugging tool

Applications and Tools to share files in Ubuntu / Linux

Crossftp: It is a tool that makes it very easy to handle FTP-related tasks.
d-lan: A LAN for file sharing.
Deluge: It is a free software, cross-platform lightweight BitTorrent client.
dropbox: It is a free service that allows you to take your photos, documents and videos anywhere and share them easily.
sweet: It is a tool that makes it possible to share selected local directories through the web.
ownCloud: The goal of ownCloud is to give you access to your files wherever you are
quazaa: A multi-network peer-to-peer (P2P) platform for sharing files between clients.
PushBullet: Connect your devices, making them feel as one.
qbittorent: The qBittorrent project aims to provide a free software alternative to uTorrent.
SpiderOak- Real-time collaboration for privacy-conscious companies and teams
syncthing: Replaces patent cloud and sync services over something open, trusted, and decentralized.
TeamViewer: PC remote control / remote access software, free for personal use.
Transmission: Simple, lightweight, multi-platform torrent client.
Puget: The best download manager for Linux.

Terminal for Ubuntu / Linux

GnomeTerminal: A widely pre-installed terminal emulator in the Linux world
Guake: It's a top-down terminal for Gnome
Console: The best terminal for the KDE desktop.
Rxvt: A terminal emulator for X11, a popular replacement for the 'xterm' standard.
rxvt Unicode: It is a fork of the most popular terminal emulator.
terminater: It is the most powerful terminal emulator on Linux, it is packed with features.
Termite: Simple terminal emulator based on the VTE library, extendable through Lua.

Utilities for Ubuntu / Linux

Actionz: Automation Task Utility for Ubuntu / Linux
bleach-bit: Quickly free up disk space and protect your privacy. Free Cache, clear cookies, clear history, delete temporary files, delete records and more ...
Brazier: CD / DVD burner.
Caffeine: Prevent ubuntu from shutting down AUTOMATICALLY.
Clonezilla: is a partition and disk image / cloning program similar to True Image® or Norton Ghost®.
Easystroke: is a gesture recognition application for X11.
Enter: makes your life easier by securely managing your passwords and other important information.
Convertall: Convert all units.
GD map: A tool to visualize disk usage.
Gnormalize: Audio converter.
GParted: Disk partition utility for Ubuntu / Linux.
GRAdio: Radio software for linux ubuntu -.
handbrake: Video converter.
KeepPass: Windows password manager, with a bit of cross platform support through Mono.
KeePassX: Multiplatform password manager.
ImageMagik: It is a set of command line utilities for modifying and working with images.
LastPass: Password management platform.
power top: Diagnose powerconsumption problem.
Press Audio: Enhance Linux Audio with custom profiles.
Peacep: Utility to decompress compressed files
Sensor: Graphical Hardware Temperature Monitor for Linux.
Noteworthy: Best Markdown editor on Ubuntu / Linux.
Remind: A remote management tool for Linux and other Unix.
System load: Show systemload in status bar.
Synaptic: It is a graphical program for apt package management.
BPD: Optimize Linux battery.
variety: It is an open source wallpaper changer for Linux, packed with great features, yet lightweight and easy to use.
VirtualBox: It is a comprehensive general purpose virtualizer for x86 hardware, targeting server, desktop, and embedded use.
XtremeDownloadManager: A good download manager with a cool user interface for Linux.
WallpaperChange: Automatically change the wallpaper.

Video Tools and Applications for Ubuntu / Linux

Bomi Player: A powerful and easy to use media player.
Kody: A free and open source (GPL) media center software for playing videos, music, pictures, games and more.
MPlayer: It is a movie player that runs on many systems, it plays all audio and video formats.
MPV: Multiplatform multimedia player.
SM Player: Media Player with built-in codecs. Plays all video and audio formats.
SVP: It allows you to view any video on your desktop computer using frame interpolation, as it is available on high-end televisions and projectors.
VLC: It is a free and open source media player and framework that plays multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.

Window managers for Ubuntu / Linux

2bwm: A fast floating window manager.
awesome: Highly configurable window manager.
bspwm: Window manager based on binary partition space.
DWM: A dynamic window manager for X.
Flux box: A lightweight and highly configurable window manager.
Herbstluftwm: Manual Mosaic window manager for X.
i3: An improved dynamic tile window manager.
Openbox: Highly configurable and lightweight X11 window manager.
xmonad: Window manager X11 tiles written in Haskell.

Other Applications and Tools for Ubuntu / Linux

Fail2ban: It allows you to scan files (eg / var / log / apache / error_log) and ban IP addresses that show malicious log signs - too many password failures, looking for vulnerabilities, etc.
GrubCustomizer: It is a graphical interface to configure the grub2 / Burg and menuentries settings.
mycroft: AI for everyone

This impressive list is based on Awesome-Ubuntu-Linux de Luong Vo Tran Thanh, who has done a great job.