Sonic is a platform that integrates remote control debugging and automated testing of mobile devices, and strives to create a better user experience for global developers and test engineers.

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

LangSmith Observability gives you complete visibility into agent behavior with tracing, real-time monitoring, alerting, and high-level insights into usage.

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

End-to-End Testing & Debugging powered by OpenTelemetry

Uptime Kuma is an easy-to-use self-hosted monitoring tool.