Mockoon is the easiest and quickest way to design and run mock REST APIs.

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

Swagger UI allows anyone — be it your development team or your end consumers — to visualize and interact with the API’s resources without having any of the implementation logic in place

Agentic QE Fleet is an open-source AI-powered quality engineering platform designed for use with Claude Code, featuring specialized agents and skills that surface quality-related information for a product at any stage of the SDLC.

Achieve effortless quality with zero coding, zero maintenance, and the autonomous power of the world's first open-source testing agent.