swarm is a screensaver showing an mesmerizing simulation of a swarm of bees following a single bee. It is a chaotic nonlinear mathematic system. The user is free to play with all the parameter constituting this system and thus he/she might be able to find new undiscovered parameter areas exhibiting a new behavior.
It is very similar to an old X-windows screensaver but does not share any code nor the equations. In fact I've not seen the source code of the original X/Windows swarm screensaver. Also this screensaver unlike the original lets you play with all the parameters constituting this system. It ever gets more interesting on faster machines, since one can increase the complexity of the system by e.g. increasing the number of bees.