Originally a popular project on Microsoft’s now-defunct CodePlex platform with over 100,000 downloads, WebServiceStudio is a GUI-based tool designed specifically for testing .NET web services. It allows you to:

: It effectively handles non-trivial web services that use more than just simple strings and integers, allowing you to fill out complicated request objects. Where to Download WebServiceStudio.exe

: Simply provide a WSDL endpoint, and the tool fetches the definition to generate a .NET proxy on the fly.

: A well-maintained version upgraded for .NET Framework 4.5.1 and Visual Studio 2013.

WebServiceStudio.exe: The Essential "Plain Jane" Tool for Web Service Testing

Since the original CodePlex site was archived, the community has kept the tool alive through several trusted forks and repositories. You can find modern, updated versions (some adding support for newer frameworks and WCF) at:

For years, developers and web service implementers have relied on a compact, no-nonsense utility known as to bridge the gap between complex web methods and simple verification. Often described as a "Plain Jane" tool, its brilliance lies in its ability to interactively invoke web methods without requiring the user to write a single line of client code.

: It displays all available web methods; you can select one, input parameters, and hit "Invoke" to see the real-time response.