BlenderPeople, free software for crowd simulation usable with the Blender animation suite
CrowdIT, Crowd tool for 3d studio Max
DI-Guy AI, Crowd simulation application and SDK
Legion, Pedestrian simulation software
MASSIVE, the software used in The Lord of the Rings films.
Micro-PedSim, microscopic (multi-agents) pedestrian traffic simulation.
NetLogo, a free software for multi-agent modeling, simulation, and the like.
SpirOps Crowd, Crowd tool and AI middleware used in Splinter Cell - Double Agent game.
CSG, Crowd simulation research.