Redmine

Redmine is a flexible project management web application. Written using the Ruby on Rails framework, it is cross-platform and cross-database.
Redmine is open source and released under the terms of the GNU General Public License v2 (GPL).
Features
Some of the main features of Redmine are:
•	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 and Bazaar)
•	Issue creation via email
•	Multiple LDAP authentication support
•	User self-registration support
•	Multilanguage support
•	Multiple databases support