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WCFStorm-Lite Edition is completely free It's a simpler version of the Enterprise and Personal Editions and it's great for doing ad-hoc testing on WCF services.

FEATURES:

General:
· Dynamically invoke and test WCF Services
· Dynamically invoke and test Web services written in any language
· Save your opened service and its test cases into a "project" which can be reloaded anytime
· Dynamically invoke service methods even those containing complex data types
· Load existing client App.config files
· UI-based, dynamic editing of complex data types
· Test multiple WCF and Web services within a single UI.
· Multiple-tabbed interface
· Basic and windows authentication
· Test services sitting behind a proxy
· Dynamically modify the URL endpoint of a WCF or Web service.
· Dynamically edit the service binding.
· Execution from the command line
· Supports scripting (IronPython)

Functional Testing:
· Create functional test cases and save it as part of a project
· Create and save functional test cases containing Expected results.
· Graphically compare (side-by-side) the expected results with the actual response of a service.
· Fully customizable test validation

Performance Testing:
· Create performance test cases and save it as part of a project
· Graphically display charts in real-time as the performance test progresses.
· Configurable test parameters (# of Agents, Test duration, interval etc.). You can stress out your service as much as you want.