Does JacORB interoperate with ORB x?
Basically, JacORB interoperates with any CORBA compliant ORB over IIOP. In practice, JacORB has been used successfully with at least the following ORBs (if you know of another ORB not on this list, please let me know): MICO, TAO, Orbacus, OrbixWeb, VisiBroker, ORBit, omniORB, Vitria C++ and Java ORBs.