Deliverance X is a LAN based four player fighting game which is set during the Apocalypse where the forces of light and darkness combat for the fate of the afterlife. It uses the Torque Game Engine Advanced.
FizzNetwork SDK is currently online as Shareware. This middleware provides a high level API to develop an online FPS. It is based on a client/server architecture for message passing, and has a VoIP messaging system over multicast. The libraries are based on Windows Sockets. Documentation and samples are included with the SDK.