soapUI is the world leading Open Source Functional Testing Tool, mainly it is used for Web Service Testing
You can download it from: http://www.soapui.org/
The CUCM WebDialer WDSL file can be downloaded from CallManager server using the following URL:
http://CUCM-Servername/webdialer/wsdl/WebdialerSoap.wsdl
Example file located here: WeddialerSoap.wsdl
The AXL API (which includes the WSDL and XSD files) can be downloaded from the UC Manager Webadmin Plugin Page
Example WSDL file (7.1 Schema) located here: AXLAPI.wsdl
Example XSD file (7.1 Schema) located here: AXLSoap.xsd