Freq Monster 801
FM synthesizer frontend for OPL3 compatible sound cards
Software
http://www.cockos.com/
Jesusonic - A dynamic text mode live FX processor.
http://nerds.de/
LoopBe1 - A Free Virtual MIDI Driver (Windows 64bit compatible).
http://www.maplemidi.com/
Maple Midi Tools including Maple Virtual Midi Cable (Windows 32bit).
http://www.codevis.com/
Midi Driver 1.0 - DirectX 8+ Game Controller to Midi CC
http://code.google.com/
Sticky notes for the Windows desktop
http://vmpk.sourceforge.net/
Virtual Midi Piano Keyboard (cross-platform).
http://www.wavosaur.com/
Wavosaur free audio editor.