Redmine is a free and open source, web-based project management and bug-tracking tool. It includes a calendar and Gantt charts to aid visual representation of projects and their deadlines. It handles multiple projects. Redmine provides integrated project management features, issue tracking, and support for various version control systems.The design of Redmine is significantly influenced by Trac, a software package with some similar features.Redmine is written using the Ruby on Rails framework. It is cross-platform and cross-database.