Articles about Network Protocols and Implementations

Network Programming in Age of Empires and Beyond at Gamasutra

The Internet Sucks Or, What I Learned Coding X-Wing vs. TIE Fighter at Gamasutra

Dead Reckoning at Gamasutra

Networking for Game Programmers at Gaffer on Games

GameDev.net FAQ Multiplayer and Network Programming

Media Standards

COLLADA is an open digital-asset exchange schema for the interactive 3D industry.

Networking Libraries

OpenTNL - The Torque Network Library

The Zoidcom network library is a high-level, UDP based networking library

Open Source Virtual Reality Implementations

Open Simulator

realXtend

Protocol Definition Efforts

Quake I Network Protocol

Quake II Network Protocol

Quake III Network Protocol

Virtual Reality Transfer Protocol by Naval Postgraduate School

Distributed Interactive Simulation (DIS) at Wikipedia

X3D DIS Component by Web 3D Consortium

Second Life Protocol at Second Life Wiki

Second Life Messages at Second Life Wiki

Open Grid Protocol at Second Life Wiki

Virtual World System Interoperability Standard