Hoppscotch

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.

Similar Tools

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.
API Testing Platform that automatically generates unit test cases with dependency mocks from API calls
Simple animated GIF screen recorder with an easy to use interface.
Browser and Mobile Automation Test Framework for Node.js
The worlds most widely used web app scanner.
Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).