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

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

Datadog is a cloud-based monitoring and analytics platform that provides observability and security for cloud-scale applications

Next-gen browser to build, test & debug mobile websites.

End-to-End Testing & Debugging powered by OpenTelemetry

Vigil is an open-source Status Page you can host on your infrastructure, used to monitor all your servers and apps, and visible to your users.