OpenGL Mathematics (GLM) is a header only C++ mathematics library for
graphics software based on the OpenGL Shading Language (GLSL) specification.

GLM provides classes and functions designed and implemented with the same
naming conventions and functionalities than GLSL so that when a programmer
knows GLSL, he knows GLM as well which makes it really easy to use.

This project isn't limited to GLSL features.  An extension system, based on
the GLSL extension conventions, provides extended capabilities: matrix
transformations, quaternions, half-based types, random numbers, procedural
noise functions, etc...

This library works perfectly with OpenGL but it also ensures interoperability
with third party libraries and SDKs.  It is a good candidate for software
rendering (Raytracing / Rasterisation), image processing, physic simulations
and any context that requires a simple and convenient mathematics library.

WWW: http://glm.g-truc.net/