A high quality MP3 encoder
EasyABC is an open source ABC editor
Versatile algorithmic random music generation software written in Java
Software oscilloscope using Python and tkinter
Directional Audio File Format
music composition and notation software, audio to midi converter
Music score editor
3D video music media player lyrics subtitles etc...
Open Source Podcast Publishing Solution
Free yourself
C++ class library for sound analysis, synthesis, and morphing
Extensible Brainwave Entrainment library for Java
Loop based software with jack transport, record and midi controllable
A pygame music lib.
A cross platform audio inteface
Synthesizer, mixing, sound effects, music composition and production.