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
scrum.rb is a tool for managing scrum projects. It offers a command-line tool, a GUI and a web application for managing and publishing the artifacts of the scrum process.