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FreeCAD Discord
(discord.gg)
Your own 3D parametric modeler.
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
for freecad specifically, you should check out https://forum.freecad.org and if you're interested in architecture you should definitely check out https://community.osarch.org