productboard - Beautiful and powerful product management.
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
ProductPlan - Cloud-based product roadmap software solution
Taiga - Project management platform for agile developers & designers