Believe it or not, there are also a lot of applications de open source for Mac and even for him iPhone. What's more, there is a website in which they compile in a list, and by categories, quantity of these free applications. |
Yes, even though both iOS and Mac OS X are closed operating systems, there is a plethora of great open source applications (many of which we use on Linux as well) that can run on these systems.
The page that compiles the most important ones is called Open Source Mac and has an equivalent page dedicated to free games listed by genre (Open Source Mac Games) and another dedicated to free applications for the iPhone.