- http://libre3d.com/: models and references
- https://github.com/SolidCode/SolidPython: python binding to the former
- http://www.openscad.org/: programmatic modeling
- http://slic3r.org/: open source G-code generator for 3D printers
- https://www.thingiverse.com/: collection of 3D objects
- FreeCAD: interactive 3D modelling with Python bindings