CrowdMaster is a free, open-source crowd simulation add-on for Blender 3D. It was created by Peter Noble and John Roper. The software provides a node-based workflow for setting up crowd agents. These agents can be anything from simple primitives to rigged characters. It then assigns basic properties governing their behavior.
Learn more and download CrowdMaster here: http://jmroper.com/crowdmaster/index.html
Special thanks to CGChannel for bringing this to our attention. Thanks for sharing.