Here are a few details about some other ORBs:

• Gerald Brose (of Freie Universitaet Berlin) has developed an ORB for Java called JacORB. It is written in Java and is free under the GNU General Public Licence: http://www.inf.fu-berlin.de/~brose/jacorb/.
• IONA Technologies has an ORB called Orbix that has bindings for C++, Java, Smalltalk and Ada95. For C++ see http://www.iona.com/Products/Orbix/ and for Java see http://www.iona.com/Products/Orbix/OrbixWeb/. The latter has free evaluation.
• The Oracle and Olivetti Research Laboratory (ORL) has an ORB called OmniORB2 which is free under the GNU General Public Licence but which currently only supports C++: http://www.orl.co.uk/omniORB/.
• Visigenic has an ORB called VisiBroker which supports both C++ and Java and can be downloaded free for evaluation: http://www.visigenic.com/.

The Cetus Links on ORBs are at http://www.parallax.co.uk/cetus/oo_object_request_brokers.html.