Insomnia REST - The most intuitive cross-platform REST API Client ð´
Postman - The Collaboration Platform for API Development
Requester - HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and...
Runscope - Log, monitor and measure your API usage to solve API problems fast.
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.
Advanced REST Client (ARC) - API testing tool. Which allows web developers to create and test custom HTTP requests.