I've been tapering off maintenance since 2016 or so, but it has a more actively-maintained fork over at https://github.com/nsfm/stibium (albeit with heavy LLM assistance, because it's 2026!)

YMMV – I haven't used it or closely inspected the changes, but have corresponded with the author, who seems genuinely dedicated in the success of the project.

I will note the following projects which have made recent advancements:

- OpenSCAD --- the hopefully final Release Candidate for the long-awaited update is now available: https://openscad.org/downloads.html#rc

- PythonSCAD --- for folks who want variables which change and so forth: https://www.pythonscad.org/

- CADquery --- https://cadquery.github.io/

- Build123D --- https://github.com/gumyr/build123d

Longer list/discussion at: https://github.com/Irev-Dev/curated-code-cad

Also, a more recent project by Matt Keeter, Halfspace was announced recently but didn't get much discussion here:

https://news.ycombinator.com/item?id=49881890

If you could add support for SolveSpace's 2D sketcher, and also bevels/fillets, then this might actually be useful.