Locust is an open source performance/load testing tool for HTTP and other protocols. Its developer-friendly approach lets you define your tests in regular Python code. Locust tests can be run from command line or using its web-based UI

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

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

Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).

Cloud-scale performance testing. Effortless load testing and synthetic checks at scale. Cloud-native and open-source. The next evolution of performance testing.

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