This is a basic math toolkit which includes support for vectors(2,3&4 element), matrices(3x3&4x4), quaternions, bounding boxes(2D) & bezier curves(3D) as well as affine transforms and a matrix stack.
Most calculations are performed by vDSP(Accelerate.framework) so performance should be decent although I have not performed extensive benchmarks. This is still very much a work in progress so please do let me know if you come across any particularly embarrassing oversights.
Designed for OS X & iOS, but does provide portable fallbacks. Uses the GNU C99 extensions and will therefore most likely only compile with GCC.