An EnergyPlus shell for parametric studies and more ...
cppcam is a 3D CAD app for drafting G-Code toolpaths for CNC Routers
Free CAD software
Precise gear geometry generator for spur and helical gears
This plugin exports G-Code for a wirecutter
2.5D CAD CAM emphasis on CAM and toolpaths
3D CAM program for CNC mills/lathes