During the early days, while Agile methods popularity was still at infancy, there were hardly one or two project management tools that catered to the needs of Agilists. Nowadays, I hear atleast a new tool almost every other week. I thought let me list them out here.
The following list has both Open source/freeware and commercial tools and the listing is not in any particular order.
4. Extreme Planner (Don't get confused with XPlanner mentioned above)
5. Mingle from thoughtworks
OpenLogic in turn has done a nice work of comparing the following(7 through 10) 4 open source Agile PM tools
12. GreenHopper with JIRA
17. XPlanner+ (Thanks Sezam20 for referring this tool)
You can also get additional details for some of the above tools from here.
Mike Cohn maintains the list of Agile PM tools here . (Thanks Phil for sharing the link)
Feel free to share the names of any other Agile PM tools that you might have come across and is not present in the above list.