ZenTaoPMS is an open source project management system with product management, project management, bug management, testcase management, doc management, todo management and many other features in one application.

ZenTaoPMS is also a scrum tool. The main management theory of zentao is scrum, such as story, backlog, burn down chart and so on.

For more information, please see: http://en.zentao.net/help-read-3.html