Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Redmine - Flexible project management web application
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
yodiz - Yodiz is online Agile Project Management tool, consisting of Product Backlog Management, Kanban Scrum Board, Issue Tracking Software, Team Discussions and Git/SVN Integrations.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
VersionOne - Agile Made Easier. Find out what differentiates VersionOne's top agile project management software from other scrum tools and resources.