Computer Generated Films
To make your computer do something useful in the background, rendering images is a nice idea. But if you have plenty of unused CPU cycles left, one of the most effective ways to help you out is to render films.
The films on this page were all rendered from a series of single frames using the raytracer POVRay and the (distributed) rendering manager RendView. The title pages were made using the GIMP. The resulting PNG files were encoded into AVI films using mencoder. All that runs natively under Linux.
In order to view these films under Linux, I recommend to use MPlayer.