Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
Leantime - Lean project management for startups & small teams
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Producteev - Producteev is a free task management application for individuals and teams to collaborate via the web, email, IM, mobile or desktop.
Taiga - Project management platform for agile developers & designers