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PlanITpoker - PlanITpoker is a cool on-line planning poker app that helps Agile project teams estimate projects easily.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Harvestr - All in one product management platform.