Redmine is a flexible project management web application.
Note: Some of the main features of Redmine are:
1. Multiple projects support
2. Flexible role based access control
3. Flexible issue tracking system
4. Gantt chart and calendar
5. News, documents & files management
6. Feeds & email notifications
7. Per project wiki
8. Per project forums
9. Time tracking
10. Custom fields for issues, time-entries, projects and users
11. SCM integration (SVN, CVS, Git, Mercurial and Bazaar)
13. Issue creation via email
14. Multiple LDAP authentication support
15. User self-registration support
16. Multilanguage support
17. Multiple databases support