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.
Taiga - Project management platform for agile developers & designers
Krosswall - Agile project management tool
TargetProcess - Agile Project Management Web Application
Basecamp - A simple and elegant project management system.
Plan.io - Planio makes web based project management and team collaboration more efficient and fun. It is the perfect platform for your projects, team members and clients.