Target Process

http://www.targetprocess.com/

TargetProcess is an integrated web-based software solution that helps software development teams manage software projects in an agile way by simplifying project planning, tracking and quality assurance processes. The product is designed to support geographically distributed teams and facilitate agile software development practices like Extreme Programming. In 2006 TargetProcess: Suite has won 16th Annual Software Development Jolt Productivity Award.

See the company site for more info, and don't create a pointless list of features here.

Free 5 users pack available.