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Scrumpy - A simple, beautiful and agile project management software
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Chpokify - Planning Poker Tool that saves time of sprint estimation. Agile teams management tools. Jira Integration (Import/Export), auto-summary, smart voting management.
Nifty - Manage projects, work, and communications in one place.
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
Project Management Core Concepts - Book on core concepts of project management in plain English