Swarm is a software package for multi-agent simulation of complex systems, originally developed at the Santa Fe Institute. Swarm is intended to be a useful tool for researchers in a variety of disciplines. The basic architecture of Swarm is the simulation of collections of concurrently interacting agents: with this architecture, we can implement a large variety of agent based models. Info, source code, and binaries for Swarm and related software is available through the www.swarm.org site. Swarm is not a GNU program. ֽţţϷ