2D/3D, mostly AutoCAD compatible:
Dassault DraftSight:
https://www.draftsight.com/
Graebert Ares Commander (there is Linux version too):
https://www.graebert.com/cad-software/ares-commander/
Bricsys BricsCAD (there is or was Linux version too):
https://www.bricsys.com/
Monstrous 3D CAD system, on league of its own - Dassault Catia:
https://www.3ds.com/products/catia
Architectural - Graphisoft Archicad:
https://graphisoft.com/solutions/archicad/
Architectural, engineering - Nemetschek Allplan:
https://www.allplan.com/index.php?id=13001
So let's repost all of the popular Reddit content here ;D