1. HTTPie

    CLI HTTP that will make you smile. JSON support, syntax highlighting, wget-like downloads, extensions, and more.

  2. ✓
    HTTP Toolkit

    Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, CLI tools, scripts and more.

    freemium €6.0 / Monthly (for a Pro subscription)

  3. Fiddler

    Fiddler is a debugging program for websites.

  4. ✓
    Postman

    Postman is the most efficient way to test, develop and document APIs.

    freemium $8.0 / Monthly (Per user/month billed annually)

  5. Insomnia REST Client

    The most intuitive cross-platform REST API Client 😴

  6. cURL

    cURL is a computer software project providing a library and command-line tool for transferring data...

  7. 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.

  8. Paw

    Paw is a REST client for Mac.

  9. Charles

    HTTP proxy / HTTP monitor / Reverse Proxy

  10. RESTClient

    RESTClient can be used to test variety of HTTP communications and RESTful webservices.

  11. StopLight

    StopLight, providing engineering teams with the best way to document, test, and build web APIs.

  12. RESTer

    A REST client for almost any web service (Firefox and Chrome extension).