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Open CAD Studio
(open-aec.com)
All about open source! Feel free to ask questions, and share news, and interesting stuff!
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FreeCAD has become pretty good lately. If you have tested it before v1.1 (March 2026) you should certainly give it a go again.
If you're fine with programming your CAD instead of visually composing it, OpenSCAD is fine as well.