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.

Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

Screenshot testing library for Android.

Achieve effortless quality with zero coding, zero maintenance, and the autonomous power of the world's first open-source testing agent.

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).

k6 Open Source is designed for load testing. Extensible to support other types of testing.