Marsyas (Music Analysis, Retrieval and Synthesis for Audio Signals) is a framework for developing systems for audio processing. It provides an general architecture for connecting audio, soundfiles, signal processing blocks and machine learning.
Source code at SF is outdated! Marsyas is now hosted at GitHub:
https://github.com/marsyas/marsyas
Downloads are now provided at Bintray:
https://bintray.com/marsyas