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

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

Selenium automates browsers. That's it! What you do with that power is entirely up to you.

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.

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