Firepoker - Agile Planning Poker powered by Firebase and AngularJS
Taiga - Project management platform for agile developers & designers
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Leantime - Lean project management for startups & small teams
VivifyScrum - VivifyScrum is an agile project management tool. Scrum and Kanban boards to visualize your projects. Team management, Git Integrations, time management and invoicing available
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.