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

Performance testing with Flood increases customer satisfaction and confidence in your production apps and reduces business risk.

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.

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

Free browser plugin to measures page load time and displays it in the toolbar.

WebLOAD – Performance and Load Testing for the Most Challenging Web Applications