Eclipse HTTP Client (HTTP4e) is an Eclipse plugin for making HTTP and RESTful calls. Build with user experience in mind, it simplifies the developer/QA job of testing Web Services, REST, JSON and HTTP. It is a useful tool for your daily job of HTTP header tampering and hacking.
XINS is an open-source Web Services framework supporting HTTP protocols such as REST, SOAP, XML-RPC, JSON, JSON-RPC and more.
From the specifications written in simple XML, XINS generates the Client API (.jar), the Java server code template (.war), the WSDL and the documentation of the specification in HTML (with the test forms) or in OpenDocument format.