CardiffMOO is a LambdaCore compliant MOO running several modifications including a WWW gateway. The database has been modified to handle embedded HTML tokens and several objects in the database use these to provide graphics and links to other non-MOO resources. Networker's home, Between Worlds , is a good place to start your travels.
More complete information is available, but most of the system is undocumented.
Contact Andrew Wilson for more information.