Current situation ReadyAPI DataGenerator provides different random values (random integer, email, name, city, etc.) I like this function since it creates nice test data. However, the random values...
In SoapUI OS, have implemented the data generation when a new step is added for REST requests of just one method using the following library as the editor shows empty request page (unlike SOAP where at least xml nodes are shown) couple of years back. Little complex to implement though.