MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
VJmachine - Music Visualizer - Make a VJ show like a PRO. Music visualizer for a unique tight symbiosis of sound and video.
Smash Notes - Smash Notes is podcast summaries you can learn from. Create all your summaries on Smash and then distribute them anywhere on social media in one easy step. Even embed it on your podcast website!
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Slid - Capture knowledge from online videos, courses, and webinars
R4 - R4 is a standalone OpenGL accelerated program (created by Gordon Williams of RabidHaMsTeR.