libfive is a software library and set of tools for solid modeling, especially suited for parametric and procedural design. It is infrastructure for generative design, mass customization, and domain-specific CAD tools.
W. Lavrijsen, and A. Dutta. Proceedings of the 6th Workshop on Python for High-Performance and Scientific Computing, page 27--35. Piscataway, NJ, USA, IEEE Press, (2016)