Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Taiga - Project management platform for agile developers & designers
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
TargetProcess - Agile Project Management Web Application
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.
Leantime - Lean project management for startups & small teams