projectM is an open-source project that reimplements the esteemed Winamp Milkdrop by Geiss in a more modern, cross-platform reusable library. Its purpose in life is to read an audio input and to produce mesmerizing visuals, detecting tempo, and rendering advanced equations into a limitless array of user-contributed visualizations.

projectm-visualizer.org
github.com/projectM-visualizer/projectm
github.com/OfficialIncubo/milk-fk/tree/master/milk
github.com/OfficialIncubo/projectm
sourceforge.net/projects/projectm (2012)

Foobar2000 components:

www.foobar2000.org/components/view/foo_vis_projectM
foo_uie_vis_projectM

Android

play.google.com/store/apps/details?id=com.psperl.prjM

Steam

store.steampowered.com/app/1358800/projectM_Music_Visualizer