Protégé

Licence: Other Open Source
Version 3.3.1 | Release Date: 2007-08-24 | Download

Many; see:

http://protege.stanford.edu/download/release_notes/release_notes.html

Version 3.2.1 | Release Date: 2006-12-20 | Download

See http://protege.stanford.edu/download/release_notes/release_notes.html for the list of changes. Most significant (IMO) is the new support for transactions.

Note that OWL and other plugins are also available - see the website.

Version 3.1.1 | Release Date: not specified | Download
No changes specified