I have been using this CorelCAD 2019 bundle mentioned awhile back for about a year now with only few minor gripes about it. It occasionally gives an error and will not open until I reboot. Probably a conflict with one of the other programs I run. It also does not have the system variables like draftsight has & if a lisp program uses a system variable that lisp program will not work. I just came across a reasonably priced perpetual license intelliCAD alternative at $250 or $350 with additional 3D features. Compatible CAD Software for .DWG files - CMS IntelliCAD - Compare CMS IntelliCAD vs Autodesk AutoCAD They give you a 20% discount after downloading the 15 day free trial version. After I test this for the next week, I will probably buy the version with the few more features and hopefully will be able to use it for 5 years or so before upgrading again. I mostly use the CorelCAD to for 2D geometry, but with the additional 3D features maybe it will change my workflow some.
The Draftsight & CorelCAD are probably based on the same core software from Alternative CAD Platform | IntelliCAD Technology Consortium When this intellicad 1st went open source many years ago, the source code was free, but that changed very quickly. I probably have that original source code somewhere & was able to compile it & worked just like the intellicad 98 by Visio I had bought. I actually used that opensource intellicad to troubleshoot AutoCAD DWGs that would not open in AutoCAD. I could usually open the file in intellicad, save it as DWG or DXF (if DWG didn’t work) & then be able to open it in AutoCAD.
[Edit 11/13/021] I got an even better price break on it, 40% off. $210 instead of the $350, so I bought it.