Create and edit technical CAD drawings.
Free open-source desktop software; local hardware required. Alpha release.

Design & creative
Design parametric 3D parts and produce dimensioned technical drawings.
Design parametric 3D parts and produce dimensioned technical drawings.
Draft parametric BIM structures, 2D architectural elevations and 3D solid construction models using open-source FreeCAD instead of proprietary SketchUp subscriptions.
Steep learning curve: users report it is "impossible to learn by trial and error" and that the UI is not discoverable. Not full AutoCAD compatibility; DWG round-trip fidelity and production drawing standards need separate verification.
Each comparison covers the workflow described above, rather than every paid feature.