The Orientation Library is a collection of routines for rotation/orientation manipulation. It ranges from general tools to others for crystal orientations. It is written in C and is well-documented. An interactive program enables to run the routines.
Thanks for Orilib, it's the best!
Excellent routines for crystallographic orientation calculations, easy to use, and very complete documentation.
Great job on routines which enable to manipulate the 3D orientations.