projectM

You want dazzling visuals dancing to your music without closed commercial software. projectM is open and powerful: the most advanced open-source music visualizer, generating real-time visuals from audio and compatible with many MilkDrop presets.

Features

Music Visualization: Visuals from audio.

MilkDrop-Compatible: Tons of presets.

Embeddable: Integrate into apps.

Open Source: Cross-platform, free.