Schnolgo is a multi-format musical composition package written in Python. It is built with an extremely flexible system for representing rhythmic structures and is intended to allow for songs to be written so as to make use of "guided improvisation".
Cabel is a graphical user interface for building Csound instruments by patching modules similar to modular synthesizers. Cabel modules are defined in XML files, so anybody with some Csound knowledge can write his/her own modules and play with them.
A modular audio programming language, designed to write applications quickly. Its main goal is real time audio processing, but it should be used for any kind of development.
Pymprovisator is a program for jazz musicians. Jazz music is based on improvisation and this program is intended to help musicians to improvise. The user sets the song parameters and the program generates a MIDI file with an adequate accompaniment.
Remote access to Ableton Live's Python API framework. Currently supporting telnet, access, UDP linewire, Open Sound Control, example code and API provided. Written in Python.