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Nightingale REST API Client - Nightingale is a fast, resource-efficient, and full-fledged REST API client for Windows 10.
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.
Hurl.it - Hurl makes HTTP requests.
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.
RESTClient - RESTClient can be used to test variety of HTTP communications and RESTful webservices.