There are lots of forum topics about C++ math libraries (like CML, GLM, Eigen, etc.), and I've used many of them in past projects.
However, my next project is going to be C (C11), not C++, so now I'm looking for a good C math library. I'm not having much luck finding one that isn't just someone's pet project.
Anyone have recommendations for good C math libraries that have been battle-tested in real projects?