"Web Service Activity Documents":http://www.w3.org/2002/ws/#documents (SOAP, WSDL, etc.)
Spacecraft orbits
** "Satellite Situation Center (SSC) System and Services":http://sscweb.gsfc.nasa.gov/index.html
** "SSC webservice":http://sscweb.gsfc.nasa.gov/WebServices/ including soap/rest for location/graphics/conjonctions queries
** "http://sscweb.gsfc.nasa.gov/WebServices/tipsod/":http://sscweb.gsfc.nasa.gov/WebServices/tipsod/
WSDL
** "SOAPui":http://www.soapui.org/SOAP-and-WSDL/getting-started.html support for testing WSDL / SOAP based services;
** "How to test a webservice":http://www.joecolantonio.com/2011/04/13/how-to-test-a-web-serviceiwsdl/
database web services
** "AMDA, CL etc. web services":http://clweb.cesr.fr/webservice.html
** "Helio/space models, data, services, catalogs":http://solarsystem-interoperability.eu/services/
** "IMPEX services":http://impex-portal.oeaw.ac.at/api-view#!/methods/getParameterAMDA
** "CDAWeb service":http://cdaweb.gsfc.nasa.gov/WebServices/
** "AMDA webservice software":http://cdpp-amda.cesr.fr/DDHTML/AMDA_SOFT/software.html (OBSOLETE)
** "Impex trees":https://github.com/FlorianTopf/impex-portal/tree/master/trees (ccmc, amda, clweb, etc.) (OBSOLETE)
** "impex wsdl methods":https://github.com/FlorianTopf/impex-portal/tree/master/methods (OBSOLETE)