soapUI, is the world leading Open Source Functional Testing tool for Web Service Testing. It supports multiple protocols such as SOAP, REST, HTTP, JMS, AMF and JDBC. soapUI is from eviware, the Open Source TestWare Company.
So far in this series (click here for an index of the complete series, as well as supporting screencasts), I have illustrated how to develop both a LO-REST, AJAX-Friendly service, as well as HI-REST services adhering to the unified API of HTTP. In the very first post, I touched on some aspects of REST, but I haven’t spent much time on the benefits of following a RESTful architectural style. I made mention of the fact that RESTful services follow the "way of the web". As it turns out, this proves to be quite powerful.
Here's the deal: you develop your complete Web API in source code. Make sure it's well-documented and that the metadata is correct, but don't worry about deployment descriptors, servlet configuration, packaging, or even interoperability. Then invoke Enunc