SoapOpera is a multi-protocol, multi-transport SOAP with ORB, currently runs on Squeak3.x
SoapOpera consists of two parts: SoapCore and OperaORB.
SoapCore is a SOAP implementation for Squeak (including SOAP RPC). It acheves some interoperability with other SOAP, such as SOAP4R, Splash/Spray.
OperaORB is a tiny ORB wrapper on SOAP.