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

Percy is a visual testing and monitoring tool that focuses on detecting visual changes in web applications

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.

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

Gatling is a powerful open-source load testing solution that integrates with your development pipeline. It includes a web recorder and colorful reports.