MCS-rm - MCS-rm is a rental management software that manages and controls the efficiency & profitability of hire operation.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
ProdEval - At tcwsoftware.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
Pandell PA - Pandell PA is a production accounting software that offers remote-user convenience, automated government reporting, data integration and personalized product support.
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.