Collabtive – Web and Cloud Based Open Source Project Management Software
http://collabtive.o-dyn.de/

Collabtive is a web-based project management software published as open source software. It strives to provide an open source alternative to proprietary tools like Basecamp or ActiveCollab. Collabtive was started by Philipp Kiszka and Marcus Fröhner in November 2007. Their main design goals included simplicity, clean design, and visual beauty. Collabtive is written in PHP5 and uses an AJAX-based user interface. It is multi-language capable, supporting more than 30 languages. Collabtive integrates with other webservices via an XML API. It also provides for importing functionality and data from other applications. It allows the user to work with to-do lists, milestones, files and to track the time worked on a task-by-task basis. This has been added to Research Resources Subject Tracer™ Information Blog.