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

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

Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

Professional software tool for HTTP testing and debugging

Voiden is a developer-first API client with local storage, Git-integrated, all based on markdown + offline support.