Amoeba is a fast-paced, cross-platform OpenGL demonstration by Excess,
showing realtime graphics effects in perfect sync with music. It
features a full customizable demo engine, several visual effects, lots
of graphics and a pumping soundtrack.

Amoeba won first prize in the demo competition at Underscore 02, a
demoscene party held in Gothenburg, Sweden (http://www.underscore.sh/)

Note that this is only the demo engine -- to watch the demo itself, you
will also need the package amoeba-data.