LilyPond

Licence: GPL
Version 2.10.33-1 | Release Date: 2007-10-18 | Download
No changes specified
Version 2.12.2 | Release Date: 2006-01-25 | Download

Complete list of changes since version 2.10 found here (its a PDF);
http://lilypond.org/doc/v2.12/Documentation/topdocs/NEWS.pdf