AudioVizSDL is a realtime oscilloscope, vu meter, spectrum and voiceprint audio visualization.
originally i wrote this software as a plugin for gstreamer in linux, but finally found time to port it to windows and added opengl support. now the rendering is hardware-accelerated.
here's a video demonstration of AudioVizSDL in action:
Video: valkatr_-_audiovizsdl_2.mp4 (35,8 MB) (Lichtmond - The Journey  - (13)_[Lichtmond]_Children_(Inner_Vision)_(Single_Mix).flac).
you can try it yourself and playing your own favorite music.
here are the binaries: audiovizsdl_ver3.zip (9,2 MB).