CAD

Glad it seems to be useful! I am a little concerned (if that's the right word for something I'm not invested in at all yet) that the dev seems to have made something fit for his purposes, namely designing 3D printed enclosures for electronics projects, that nothing much else will come of it. As for the UI, he seems pretty committed to that space bar menu. He was around on the matrix room as recently as last month though.

The other oddball place to find open source mechanical part design in is the Salome FEA package, which updated its part workbench a year or two ago to go fully parametric. Salome is the opposite of lightweight on any OS, though, and installing it on Kubuntu was one of the more unpleasant such experiences I've had recently.