Helios is a classic particle attraction/repulsion screen saver
Helios 1.5 (August 28, 2009)
Helios is a particle attraction/repulsion screen saver where "blobs" emit and receive multi-colored particles. It's difficult to describe, but as some have said about the screen saver, it's pretty insane. Helios is available in English, French, German, and Italian.
Helios requirements:
* Required: Mac OS X 10.3.9 or later
* Required: ATI Rage 128 video card or later
* Recommended: ATI Radeon 9000 video card or later, or nVidia GeForce 4 video card or later
What's new in version 1.5:
* Helios is now compatible with Mac OS X 10.6 ("Snow Leopard").
http://seiryu.home.comcast.net/~seiryu/savers.html