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.

Automate API workflows. Chain HTTP requests. Validate. Zero code.

API Testing Platform that automatically generates unit test cases with dependency mocks from API calls

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

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

Gatling is a powerful open-source load testing solution that integrates with your development pipeline. It includes a web recorder and colorful reports.