Is it possible to consume some third party web service from Alfresco. If that is possible please provide some basic explanation, example or documentation how to do that!
You can easily inject your own Spring Bean in the Alfresco extension Spring application context, and in this way you can expose your own Web Services API. You can bind your custom methods with the internal Repository Policies too, for example for each content update or other internal behaviour you can invoke your own calls to your own Web Services API.