Modding Sites

This is a list of links to external sites dealing with creating Mods with the Source Engine.

General Sites

This is a list of external modding related sites that do not quite fit into any specific category.

Official Source SDK Forums and the now-defunct VERC Network Forums
Game Design Theory - Interesting for art directors, team leaders
Detler's Team - Mapping, modelling, coding and useful sourses on Russian.
Gamedesign.net - Some helpful modding and mapping tutorials. (broken site)
GamesModding.com Tutorial Database (Down) archived version - A list of almost every Half-Life 2 modding tutorial out there.
HL2World.com - Half Life 2 Knowledge Base
Interlopers.net - News and general resources
Mapcore - A great place to get mapping, modeling and texture help from industry pros.
Mod Database - Free listings of mods for almost every moddable game. A great database full of tons of information on mods that are out there.
Nem's Tools - Several useful Source tools including GCFScape
SourceWiki Forums - (Main site now closed)
Type 3 Studios - Mods, Maps, Tutorials, Forums, and a thorough community site on the way.
Wavelength - One of the original sources of HL1 editing material, now steadily servicing HL2
Wunderboy.org - Several useful Source tools including VTFTool

This is a list of sites about mapping, including tutorials, articles, communities, etc.

World of Level Design - Website dedicated to mapping tutorials, 3d environment modeling, level design articles. Creative toolset to becoming a game level designer and 3d environment artist.
Creating Worlds - A large number of articles focusing on the design aspect of level design
Edit Life - Mapping articles, entity list, error documentation and forums
Half-wit 2 - Another collection of Mapping tutorials
I Wanna Map - You wanna map, We wanna help. For Tutorials and help
SDK Nuts - Source mapping tutorials
Mapping-area - Tutorials on Mapping, Beginner to Advanced, all in French!
Spillmodding.no A Norwegian mapping community with more than 130 tutorials for more than 13 engines!
zombie's Optimizing-page information on optimizing your map
TAz00.com 22+ Tutorials on Mapping, Beginner to Advanced, 10+ Maps with source files included!
TWHL - Mapping community and tutorial site with busy forums for HL and SOURCE mappers.
The Snarkpit - Mapping and modeling community site
ThinkingWithPortals - Portal mapping community and public download database
TF2Maps.net - mapping forums and resource site for TF2
FPSBANANA > Tutorials - Tutorials related to a variety of Source Games

This is a list of sites relating to programming, covering both general and HL2 specific topics.

Microsoft Developer Network
DevX
Programmer's Heaven
Tech books for free
thefreecountry
The Code Project
Dev Articles
Code Beach
Dev Shed Forums
Stack Overflow - a collaboratively edited question and answer site for programmers
dreamincode
daniweb - IT Discussion Community - Software Programming with sample code and tutorials
objectmix - Application Development Forum
programmingtalk.com - a programming, coding, and design oriented community
Learn-Programming.za.net
codingforums
developerFusion

OpenGL.org - official site for OpenGL information
NVIDIA Developer Zone - OpenGL, DirectX, PhysX, and CUDA resourses
AMD Developer Central - Resources for GPU programming and development
Intel Developer Center
Rocket Commander Tutorials - 10-Part Howto make 3D Games Tutorial.
Directx C++ - Documentation for Unmanaged Directx.
Directx Managed - Documentation for Managed Directx.
Managed Directx Info - Includes various resources, tools, samples, code snippets for Managed Directx.
GameProgrammer.org - Resources on OpenGL and DirectX game programming
Gamedev.net - Website with a lot of useful resources for game developers.
oZone3D.Net - Tutorials and resources for OpenGL, DirectX and LUA programming
DevMaster.net - General game development news and coding resouces
Game Programming Wiki - programming tutorials and source code for a variety of languages and platforms

Mattie's Eventscripts - Great for gaining some minor coding experience, simple plugin addon for Source games.
Razvanadrian - Half Life 2 Coding
Detler's Site - Lots of Half-Life tutorials, especially on coding in Russian

Quake Engine Source Code - Source code from old Quake (used by Half-Life too) and Doom games.
Mech Commander 2 - Entire game and source code. Can serve as an example for learning programming.
Plan of Attack Source Code - The entire source code (including art assets) for the Plan of Attack mod, free to use in other mods.
Full Half-Life SDK: Fileplanet / Sourceforge

This is a list of sites related to modeling.

Cannonfodder's Tools - 3DSMax Importers and Exporters, Dispgen - Displacement Terrains from heightmaps, StudioCompiler - Model/Texture Compiler/Decompiler, winBSPzip - BSP Packer
RnL Forums' Lightwave Plugins - Lightwave mesh export plugins. Not currently available, but may be in the future.
Insects Infestation - II SDK modeling Export models to Source engine tutorials for 3DSMax, Maya, MS3D, XSI, FRAG.
CG Talk The largest and most useful model discussion/news site on the internet.
Digital Tutors - Excellent video tutorials, free and packaged, for using SoftImage|XSI and Adobe Photoshop
polycount - Articles and forums on game modeling
Ben Mathis' modeling tutorials
CDG.net Forums - A great resource for learning about, downloading and releasing models.
CG Arena - Graphics and Animation Community for Digital Artists
ShareCG.com - a large collection of free Computer Graphics resources]
CG Cookie - an online education resource for cg artists working with various popular applications