Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.
Taiga - Project management platform for agile developers & designers
Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.