Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
rerail.io - Remote Sprint Planning Poker Tool
Methodist.io - Methodist provides free online agile services for distributed agile teams. Planning poker & Retrospective online boards.
PlanITpoker - PlanITpoker is a cool on-line planning poker app that helps Agile project teams estimate projects easily.
DinoSize - DinoSize helps teams have fun, engaging and effective planning sessions.