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.
Apache JMeter - Apache JMeter™.
PractiTest - PractiTest is a cloud based Innovative test management tool.
Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
locust - An open source load testing tool written in Python.
TestLink - Test & requirements management