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Postman - The Collaboration Platform for API Development
Insomnia REST - Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.
soapUI - SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.
RapidAPI for Mac - Paw is a REST client for Mac.
Guzzle - PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services
cURL - cURL is a computer software project providing a library and command-line tool for transferring data...