Well, not really. At runtime on JBoss AS there's a MBean that gives these info or you can use a ServiceLoader to get the configured org.jboss.wsf.spi.management.StackConfigFactory which in turn can be used to the the StackConfig that has getImplementationTitle() / getImplementationVersion() methods. Things change a bit dependending on the version you're using.
Alternatively, look for the jbossws-*-client.jar. The manifest in there tells you what stack is in use and the version. Of course, there's jbossws-cxf-client.jar and jbossws-native-client.jar.
Thanks a lot, Alessio!
This will help me a lot. I checked the as 4.*, 5,*, even 6.*, all include the jbossws-*-client.jar, but for as7, I can't get it. This is change for as7?
In AS7, look at modules/org/jboss/ws/jaxws-client/main/, there's jbossws-cxf-client.jar by default (and when installing jbossws-native, that is replaced by jbossws-native-client.jar).