Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
PlanITpoker - PlanITpoker is a cool on-line planning poker app that helps Agile project teams estimate projects easily.
Dropbox - Online Sync and File Sharing
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
Google Drive - Access and sync your files anywhere
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).