Atlassian JIRA - Atlassian JIRA is a project management and tracking software for the business users, developers, programmers, etc.
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Pivotal Tracker - Pivotal Tracker: The awesome, lightweight, agile project management tool for software teams. Get your 30-day Free Trial started today!
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
Taiga - Project management platform for agile developers & designers