I'm looking for a standalone application to show some nice-looking video special effects, computed in real-time from the sound output (such as what Winamp was doing with plugins).
The context: I'm using Mixxx to handle an audio playlist, and with a projected external display I'd like to show some visual effects based on the sound output I'm generating. (All this with Pulse-audio).
Does this kind of application exists? What is the name to search for? I've tried many searches on the web, w/o finding the correct type of program.