Codegiant - Codegiant - Issue tracking, git repositories, continuous integration and documentation in a single platform.
Software Product Management Stack - Resources & tools to help you manage your software product
GoRetro - a free retrospective tool for your Agile sprints
The Product Management guide - A book on how to create and ship products that people love
Scrumpy - A simple, beautiful and agile project management software
Product Management Exercises - A repository of product manager job interview exercises