FreeSOLID is a library for collision detection of three-dimensional objects
undergoing rigid motion and deformation. FreeSOLID is designed to be used in
interactive 3D graphics applications.
Voxel CAD. Open source voxel editing and analyzing software. Edit and create multi-material voxel objects. Simulate the dynamics in a quantitative physics sandbox to test engineering designs or make moving creatures. www.voxcad.com for videos.
A free, industrial quality library for simulating articulated rigid body dynamics - for example ground vehicles, legged creatures, and moving objects in VR environments. It's fast, flexible & robust. Built-in collision detection.
Simple-space-simulation is simple 2D physical realtime simulation of objects in space witch can move and in iteract including colision detection and gravitation.
Yaobi is a fast collision detection library for general triangulated objects. It uses a hierarchical representation based on oriented bounding boxes. Yaobi compares well with other libraries when it comes to speed and memory consumption.