BricsCAD

I use version 17 of the BricsCAD for Linux for aproximately 1.5 years. The review is based on this experience.
PRO:

1. Similar to AutoCAD: 2D/3D dwg files, system variables, supports AutoCAD commands, works well with AutoLISP.
2. Cheaper than an AutoCAD.
3. Has versions not only for Windows.
   CONS:
4. Very unstable under Linux: crashes, freezes.
5. After the number of parts in the model over 5-10 work is very slowed down.
6. Problems with non-ASCII encodings.
7. Very inflexible. Not enough settings, some settings that are not working.
8. Terrible support. For more than a year, I have been contacting the support service and have not received any real help.

[Edited by umix, October 17]

It does everything I used to do in AutoCAD LT, with very similar functionality, and it works on Ubuntu, which is a big plus. I'm a structural engineer and tried all of the free options, none of which were anywhere near developed enough and lacked essential functionality such as XRefs (which are a big part of my work). It is too expensive for casual users to consider (unless 1 month free trial is enough for you!), but all of the viable options seem to have similar prices. I was previously using Draftsight before they dropped support.

I am only giving 4 starts as although it works well, there are a few rough edges and for this money there shouldn't be any!

Modeling in rendered mode is made easy. You can learn it in just about an hour thanks to the Quad interface, reducing clicks to an minimum.

I don't know anything about it yet. I am browsing looking for alternative to TurboCAD MAC.