Xivio.com was a commercial children's virtual world website created in 2006 by Gavin Conrad. This is the legacy World Server Java Core made available to the world to do with as it wishes.
Multi-purpose, platform/language independent Server with the ability to handle multiple concurrent connections on 1 socket, interactively/dynamically starting and stopping service modules. Needs only 1 port opened to access many different services.
Moonbeam is a xml socket server written in java. Its primary use is targeted on building multi user applications - anything that reaches from chat rooms, over games to instant messengers.
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mssd is a modular socket server written in Perl. It\'s primary purpose is to be used with Macromedia Flash clients using XML, but it provides a plug-in architecture which theoreticaly allows any TCP/IP protocol to be implemented.