If you are a #FreeCAD user and run Ubuntu, there are two PPAs that can make life easier: freecad-stable and freecad-daily. They install separate binaries, so you can switch between the stable and nightly builds very easily.
Makerdon is a Mastodon instance focused on Makers, Open Source Hardware (OSHW) and STEM/STEAM. Free and Open Source Software (FOSS) is a likely topic as well. If you're interested in making things, allowing others to build on your work, and/or teaching others about making things, you might like this instance.