Bricsys NV just released version 12 of Briscade, that alternative to AutoCAD (compatible with this obviously) and that since version 10, it works natively with files DWG.
Briscade it is divided into three versions: Classic, Pro y Platinum. Each of these versions is priced differently, and obviously the more features / options a version has, the more it will cost.
This new version brings improvements regarding 2D modeling, 3D modeling (even the Pro version has to model 3D directly), new element of the user interface called «Quad Cursor«, Which will allow 3D modeling with far fewer clicks than before. There are many more details that can be found in this version, but I honestly do not understand them, my work does not have much (or nothing) to do with 2D / 3D modeling, so I am not familiar with this type of software.
The price varies (as I said before), although you can download this software with a trial period of 30 days totally free, both in .DEB, As in .RPM, As in .TAR.GZ. As for languages, it is currently available in 17 languages ​​
Well that, this although it is an alternative to AutoCAD which is also paid, is an alternative in the end, it benefits us because it is possible for Linux users to use it 
regards