Bruno is a Fast and Git-Friendly Opensource API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.

ReadyAPI is a low-code API testing platform for development teams that care about creating test automation across any workflow.

Fully integrated API and web service testing capabilities that automate end-to-end functional API testing.

Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.

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

Hand-crafted lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage.