Postman - The Collaboration Platform for API Development
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.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
Redmine - Flexible project management web application
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.