Is there a normal CAD system as a replacement for paid AutoCAD?

Question

3D

I would like to know what free CAD systems you use.
I myself worked in AutoCAD and for me it is a very convenient program, but it is paid, so my conscience does not allow it to be used for commercial purposes. I want to switch to a free analogue with Open Source without big drawbacks. The main thing is to be able to build 3D in DWG format. Is there such a thing?

Answer 1

Nothing better was found.
en.wikipedia.org/wiki/NanoCAD
It's not open source, but there is a free version.

Answer 2

LibreCAD