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.

Comprehensive and user-friendly cloud platform for Load Testing, Speed Testing and Website & API Optimization and Monitoring

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

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

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.