Discotheek

  Discotheek changes your screen into a night club spotlight. You can use your it to generate multicolor flashes.
You can use your screen as stroboscope. You can use your screen as light (all white) or dark (all black). You can vary the speed and add or remove colors. You can also have soft transition where colors fade to the next color.
Discotheek supports multiple screens. You can run Discotheek on Windows, Mac OS X, Linux and online.