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OSS Building plan software?
(discuss.tchncs.de)
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I highly recommend FreeCAD BIM workbench.
Here you can find an amazing series with tutorials for beginners: https://www.youtube.com/playlist?list=PL3wRqQUPtE16yw_c1TnRYJmz37y2ZRTLm
There's also the channel deltahedra with great stuff!