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.

Simplifies performance and load testing so that application delivery teams can take a standardized approach to ensure continuous performance, reliability, and scalability from development to production.

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

The Complete Continuous Testing Platform Any test. Any device. App quality without limits.

Anyone on your team can load test with instant playback, an easy-to-use interface, and real browsers for reliable data.

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