TestRail’s web-based test case management is used by thousands of great QA and Development teams to efficiently organize, track and manage software testing.
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.
PractiTest - PractiTest is a cloud based Innovative test management tool.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
TestLink - Test & requirements management
Slack - A messaging app for teams who see through the Earth!
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.