LIDET - Laboratory of Interactivity and Digital Entertainment Technology

Articles:

aaai04 workshop on challenges in game ai - this workshop had the goal of identifying the problems currently facing game AI programmers, to explore the emerging techniques within development circles, and to highlight AI research that could be of potential use.
ACM Queue Game Development Issue - ACM Queue Issue on Game Development. Articles include: "AI in Computer Games", "Massively Multiplayer Middleware", "Game Development: Harder Than You Think"(good thoughts on engine complexity) and "Fun and Games and Software Development".

AnimeLog - A Game Based Animation Tool to Support the Teaching of Formal Reasoning.
AIWisdom.com - good colection of articles on Game AI and graphics. Responsible for the "AI Game Programming Wisdom" book series.
GameAi.com - One of the most popular sites on game AI on net.
John Laird's Computer Games Research Page - One of the most active researchers in Game AI.

ETC - Entertainment Technology Center - Carnegie Mellon University Research Group
SAGE - Simulation and Advanced Gaming Environments for Learning.
LARC - The Laboratory for Recreational Computing - University of North Texas Laboratory
ICAD-IGames - PUC-RIO Research Group on Computer Graphics and Games. (in the same university where LUA was created).
The Experimental Gameplay Project - small, experimental concept games, developed as an ETC project. Just check it out.
GameTools - EU project aimed at provide next generation realtime 3D libraries.
Sony Computer Entertainment US Research and Development

Game Tutorials - very professional site, ton of tutorials about graphics programming, rich in examples.
JogosPro - Brazilian game development oriented discussion list.
NeHe Productions - one of the most popular sites for game programming tutorials and news. They've also some good book reviews.

Flipcode - graphics and game programming resources and news.
Gamedev - tons of game related news and resources. Very popular site.
Gamasutra - Professional site focused in the game industry. From the same group that publishes the Game Developer Magazine and that is responsible for the Game Developers Conference (GDC). News and articles about all aspects of game programming: Programming, Game Design, Art, Production, Business and Audio. Make sure to check the Postmortems out.
Game Research and Technology - Massive colection of links to research on the technology of games, and other forms of interactive virtual worlds, by Craig Reynolds
The Video Game Revolution - from the site: "The Video Game Revolution examines the evolution and history of the video game industry, from the 1950s through today, the impact of video games on society and culture, and the future of electronic gaming".

Apocalyx - Open Source License. Used in the Guntactyx game.
Panda3D - 3D engine developed by Disney, used to create the MMO Game Toontown. Maintained by ECT.
CatMother - Interesting Screenshots. BSD License.
IrrLicht - According to the site, "an open source high performance realtime 3D engine written and usable in C++". Check the screenshots. zlib/libpng license.
OpenSceneGraph - According to the site, it's a high peformance 3D graphics toolkit, used by application developers in fields such as visual simulation, games, virtual reality, scientific visualization and modelling. Written entirely in Standard C++ and OpenGL it runs on all Windows platforms, OSX, GNU/Linux, IRIX, Solaris and FreeBSD operating systems.
jMonkeyEngine - scene graph based graphics API, BSD License, uses LWJGL. written in Java.
Wild Magic - official site for the Wild Magic Real-Time 3D Graphics Engine, version 3, whose architecture is described in the book 3D Game Engine Architecture: Engineering Real-Time Applications with Wild Magic, by David Eberly, Wild Magic License.
OGRE 3D - regarded by many as the leading open source real time 3D rendering engine. Based on some portions of the Wild Magic engine. LGPL License.