Redmine is a flexible project management web application
written using Ruby on Rails framework, it is cross-platform
and cross-database.

Feature Overview:
* 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

WWW: https://www.redmine.org/