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Redmine

Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database. It provides integrated project management features, issue tracking, and support for multiple version control options.

License: GPL
Written in: Ruby on Rails
Operating system: Cross-platform

Website: http://www.redmine.org/
Download: http://www.redmine.org/wiki/redmine/Download
Documents: http://www.redmine.org/projects/redmine/wiki