QTMAGEAR is an LGPL library for producing QuickTime MIDI movies and SMF(Standard Midi Files). The goal is to produce various alternate implementations (C/C++/PHP/Realbasic) so that developers can incorporate it into diverse development architectures.
SoundFX is an editor for digitized audiodata. SFX is designed in a modular fashion and has a comfortable graphical user interface. With SFX you can apply effects to samples, play back and record samples, and finaly can cut, trim and edit your samples.