AutoCAD
It's always funny with 3d. Graphics? You need Houdini? Of course it runs on Linux, it's a UNIX-native program after all, first version ran on IRIX because what else would you use for 3d work but an SGI workstation and Linux is the commercial successor to IRIX. Blender, the same, just 5k bucks cheaper (and not everything is nodes, not yet). CAD? Everything's suddenly windows-only because... how the hell did that came to be? Were they running 1990's CAD software on Excel machines?
I mean back in the days they should have been running on IRIX, and SGI switched over to Linux when they made the switch to x86 CPUs. Plenty of movie studios switched over to Linux workstations because of that, porting from IRIX to Linux is trivial compared to porting to Windows, why didn't the same happen with CAD?
Wintel-PCs for the longest time just weren't suitable for 3d work, they were office machines.