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).

Loader.io is a free load testing service that allows you to stress test your web-apps & apis with thousands of concurrent connections.

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.

Checks web UI for browser compatibility (Compliance with Can I Use?)

Automation Test Reporting. OSS, Language & Framework agnostic