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.
Apache JMeter - Apache JMeter™.
DevTest - Test management solution for efficient quality assurance
Beta Testing - Beta Testing is an all-in-one feature-rich technical testing solution created to help small to large size businesses test and enhance their products through insights.
locust - An open source load testing tool written in Python.
ReQtest - ReQtest is an end to end solution for test management, bug tracking, requirement management and agile project management.