Impro-Visor
Leadsheet notation with auto-generated playback, improvisation advice
... chord progressions, chord voicing keyboard, MIDI and MusicXML export. See http://www.cs.hmc.edu/~keller/jazz/improvisor for general information, including tutorials. Support and additional resources are through the user group https://groups.yahoo.com/neo/groups/impro-visor/info.
The most recent source code, since summer of 2015, is housed here: https://github.com/Impro-Visor/Impro-Visor
This started when SourceForge was down for over one week during an active development period.