Hello. This is Feir and I am working for Nature Easy Soft which focuses on developing project management tool. One of our products, ZenTao, is open source Scrum tool. It is all lifecycle management and has helped ten thousands of users. If you are done with Jira, give it a try.
The difference between zentao and other tools is zentao divides the complex project management process into four major items: story, task, bug, and case. And ZenTao supports the whole flow by these four items.
Let me know if any questions :)