REST Up - Free

Test HTTP REST requests by providing request type, parameters, and headers. The help in the application menu will provide all the details on how to use and setup the requests. The response can be save to a file for later usage with/without (raw response data) the headers. If the response consists of XML or JSON, it can be viewed in an hierarchical viewer for easier analysis.

The pay version allows saving/loading the request settings and removes the add bar.