GameDev.net - One of the most important Game developer sites
Gamasutra.com - The Art & Science of Making Games
FlipCode - Daily Game Development News & Resources
Game-Developer.com - Game Developers Search Engine
GameTutorials.com - Some Advanced/Interesting Features
LGDC - Linux Game Development Center
CFXweb.net - Demo & Game Development
Amit's Game Prog Info - Huge amount of Game info and further links
SourceForge Games Foundry - A home for Open Source Gaming
TheDC.com - The Game Developers Corner
Game Developers Conference - Home of the long running Conference
iDevGames.com - Ultimate Mac Game Programming site
GameOn - Great Game Industry Advice
SourceForge.net - World's largest Open Source development website
Developer.com - General Development Information
BYTE - Innovating Computing Magazine Since 1975
Dr.Dobbs Journal - High Quality Programming Journal
Grey Matter - Supporting Software Professionals
Cocoa Dev Central - A site for Macintosh Cocoa Developers
CodeProject - Focus on .NET/Win32/MFC but plenty of general goodness

OpenGL.org - The Premier environment for portable 3D graphics.
Messa3D - Syntax Compatable alternative to OpenGL
OpenGL Programming Guide - Red Book 1.1 Online
OpenGL Reference Manual - Blue Book 1.1 Online
NeHe Productions - No.1 Source of OpenGL Tutorials
Ryan's OpenGL Page - Basic and Advanced Topics covered
Nate Robins OpenGL - Papers and Tutorials on OpenGL
Druid's Journal - Home of glGUI and other cool GL Projects
Lev's Interactive 3D - Colourful Site with some Technical Tutorials
3D Engines - Overview of software 3D engines for portable realtime graphics
Win32 GL - Bare Basics Tutorial for OpenGL in Windows
Texture Mapping - Simple Introduction to OpenGL Texture Mapping
Fast Reflections - Introduction to OpenGL Reflections
Lighting & Normals - Introduction to Lighting & Normals

Framerate Independence - Game movement unaffected by frame rate
Volumetric Rendering - Detailed look at Rendering Fog in Realtime
Bitwise Operations in C - Refresh your Knowledge of Bitwise Operations
Tiled Terrain - Mapping Terrain with Tiled Textures
Being A Better Programmer - Top Programming/Development Tips
Terrain Reasoning - Terrain Movement for 3D Action Games
Introduction To Isometric Engines - Basics of Isometric Views
Game Design: Theory & Practice - An excerpt from the book
Mac Game Development Resources - Apple's Game Development info
RPG Game Design - Basic Elements for Successful RPG Design
Facial Animation - Very informative article on facial movement

GameAI.com - Covers Artificial Intelligence in Games.
AI Definition - Overview of the Field of AI
Clash of Civilizations - Article dedicated to Geography based AI in games.
AI Depot - Essays and Tutorials on Artificial Intelligence
Generation 5 - Excellent AI Site Covering a lot of Ground
Practical Guide To Complete Game AI [Part 2] - Two Part in-depth Article
Neural Net Components - Neural Networks, explained with Java
Bot Navigation - Neural Networks for Obstacle Avoidance
Smart Unit Navigation - More Pathfinding articles.
Toward More Realistic Pathfinding - Pathfinding with Natural Curved Paths
Coordinated Unit Movement - Smart Movement and Path Finding
Shortest Path - Dijkstra's Algorithm (With Java Example)
Smart Moves: Intelligent Path-Finding - Path Finding, including A* Algorithm

Data Compression Library - Source for most Compression algorithms
Mathtools.net - Technical computing portal for scientific & engineering needs
Mathworld - Extensive Mathematics Resource
Programming Pearls - Jon Bentleys influential Programming Book
The C Programming Language - Site dedicated to THE 'C' Book
Paul Bourke - Covers Rendering, Geometry, Modelling and more. GREAT!
The Graphics Format Page - More File Formats (specifically Graphics)
Wotsit's Format - Programmer's File Format Guide
Calculus Tutorial - Great online Introduction to Calculus
Geometry in Action - Discrete & Computational Geometry.
Recreational Mathematics - Mathematical Games and other fun stuff
Communications of the ACM - Covers a wide range of Programming Topics
Voxel Landscape Engines - FlipCode Voxel Tutorial.
FaqSys Coding - Sources, Algorithms etc.

Object Orientation
comp.lang.c
comp.ai.games
Compression
Tile Based Games
comp.graphics.algorithms
Colour Space Conversion
Unix Sockets
Mathematics
Program Threads
BSP Tree's
Neural Nets
OpenGL GameDev
EFnet OpenGL

Siggraph 2000 Papers Siggraph 2001 Papers Unicode Standards
MD2 Model Format

Zlib (Compression Lib)
STLport (Template Lib)
Libpng (Graphics Lib)
Ogg Vorbis (Audio Lib)
OGRE (Render Engine)
SDL (DirectMedia Layer)
GLUT (GL Toolkit)
Cpw (for OpenGL)
ClanLib (Game SDK)
Hermes (Graphics Lib)
OpenPlay (Network Layer)
Lua (Extesion Language)
OpenAL (Audio Lib)
MikMod (Music/Audio Lib)
FMOD (Sound System)
FreeType (Font Engine)
DirectX OpenGL Wrapper
SourceForge.net
FreshMeat.net

Association of C/C++
ACCU C/C++ Resources
Dr.Dobs C++ Section
ISO/ANSI C++ Draft
Bob Stouts Snippets
C Standard Questions
C Optimization
About.com C/C++ Pages

Microsoft Development
Apple Development
Free Software Foundation
X11/XFree86
Amiga Development
QNX Developer Network
Intel® Developer Tools
AMD Developer Tools
nVidia Developer
3DLabs Developer
ATI Developer