Mine is Local Send which is a FOSS alternative similar to air drop that works across a variety of devices.
Iβll go with FreeCAD. Iβve known about it for a while and tried it about 5-10 years ago but have given it another look as I try to get back into CAD stuff and hate the restrictive licenses of commercial products. It has come a LONG way and is far more intuitive to use than it used to be.
Have you heard? The release candidate of 1.0 dropped just a few days ago. It looks very interesting.