RESTClient - RESTClient can be used to test variety of HTTP communications and RESTful webservices.
Hurl.it - Hurl makes HTTP requests.
Requester - HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and...
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´
gURL - gURL is a free, Open Source (GPL) HTTP request generator tool.