Kerf

Kerf is a solid-modeling kernel written in Rust: B-rep geometry with half-edge topology, boolean operations, and STL, OBJ, and STEP export, backed by a full readiness test matrix.

Geometry kernels are the deep infrastructure of CAD — the part everyone depends on and almost no one writes. Kerf started as a way to understand that layer well enough to build on it: what it takes to make booleans robust, how topology and geometry stay consistent, where kernels break.

It's open source on GitHub, built and tested from scratch.