Postman - The Collaboration Platform for API Development
Graphical HTTP Client - Graphical Http Client is a utility to help you test and interact with REST-based web services.
Insomnia REST - The most intuitive cross-platform REST API Client ð´
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.
Paw.cloud - Paw is a REST client for Mac.