Impro-Visor
Leadsheet notation with auto-generated playback, improvisation advice
...Styles can be edited and created by the user. Other features include generation of roadmaps for understanding keys and idiomatic 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.