The Apache JMeter™ application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance. It was originally designed for testing Web Applications but has since expanded to other test functions.

SeleniumBase Case Plans is Test Case Management Software that uses Markdown tables for displaying test plans directly in GitHub (and other source code management systems that support Markdown format).

Professional software tool for HTTP testing and debugging

An open source JS tool for image analysis and comparison. A successor of PhantomCSS.

Design, debug, and test APIs locally or in the cloud

Mock and modify HTTP request for exploratory testing.