Information on Collision Detection from the Algorithms and Data Structures category

CD - A free collision detection library. Source code

ColDet: Free 3D Collision Detection Library - A free library intended for game programming. Supports general polygon soups and based on bounding-box hierarchies. Open source

Collision Detection and Contact Determination Papers - An assortment of papers on collision detection and contact determination papers.

Collision Detection for Virtual Reality - Overview of research by Martin Held in interactive collision detection

Computing the Distance between Objects - An implementation of the Gilbert

I_COLLIDE - An interactive and exact collision-detection library for convex polyhedra. Includes the source code (free for noncommercial use)

QuickCD - General-purpose collision detection library

RAPID: Robust and Accurate Polygon Interference Detection - A numerically robust library supporting general polygon soups

SOLID: Software Library for Interference Detection - LGPL standard C++ library for interactive collision detection

Stephane Redon - Research on physically-based modeling. Continuous collision detection

V-Clip Collision Detection Library - An implementation of the Lin-Canny algorithm for computing the distance between two closed polyhedra. Source available for noncommercial use.

V-Collide - A collision detection library for general polygon soups. Combines I_COLLIDE's "sweep and prune" algorithm with RAPID. Source available for noncommercial use.