Redmine is a free and open source project management and project tracking tool. It allows users to manage multiple projects and associated subprojects. It includes wikis and project forums, time tracking and flexible access control based on roles. It includes a calendar and Gantt charts to facilitate the visual representation of the projects and their deadlines. Redmine integrates with various version control systems and includes a repository browser and a diff viewer.
See the bio for its creator, Jean-Philippe Lang.