Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster.

A modern, resource-friendly REST client for Windows 10

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.

Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

REST API client library for .NET

Design, debug, and test APIs locally or in the cloud