Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).

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.

Firepoker - Agile Planning Poker powered by Firebase and AngularJS

Redmine - Flexible project management web application

Taiga - Project management platform for agile developers & designers

Basecamp - A simple and elegant project management system.