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The Product Management guide - A book on how to create and ship products that people love
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.
Product School - The global leader in product management training
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Intercom on Product Management - The ultimate resource for aspiring product managers
Harvestr - All in one product management platform.