This is an OpenGL bars visualization plugin (as seen in XMMS and XBMC/Kodi). It’s adapted from the jack_glbars project by Nedko Arnaudov. glBars works as a JACK standalone and audio plugin (LV2 or VST).
projectM is an OpenGL based advanced music visualization program for Linux, Mac OSX, and Windows. It is backward compatible with all the features of Milkdrop 1.x (and now 2.x), but has many new toys and enhancements.