Nifty - Manage projects, work, and communications in one place.

Product School - The global leader in product management training

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 Frameworks - Discover product frameworks used to help build products

Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.

shipit - shipit is a product roadmap and product planning tool that comes with an integrated, battle-proven approach to planning product.