http://www.redmine.org/
Multiple projects support
Flexible role based access control
Flexible issue tracking system
Gantt chart and calendar
News, documents & files management
Feeds & email notifications
Per project wiki
Per project forums
Time tracking
Custom fields for issues, time-entries, projects and users
SCM integration (SVN, CVS, Git, Mercurial, Bazaar and Darcs)
Issue creation via email
Multiple LDAP authentication support
User self-registration support
Multilanguage support
Multiple databases support
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