Web-based Scrum project management tool. It is based on Henrik Kniberg's book "Scrum and XP from the Trenches" available at InfoQ. It allows drag'n'drop sprint backlog assignation. It is already usable and under constant development.
Please download GNU tarball from wanted version in: http://windsofscrum.svn.sourceforge.net/viewvc/windsofscrum/Scrum/tags
Iodine is an Open Source Agile Project Management Tool based on the Ruby on Rails Platform. It is 100% free. Users will manage project resources such as user stories, defects, iteration plans and productbacklog without charge.