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Vanilla Capsuledecent pipe tutorial for Hammer
Day of Defeat WikiEncyclopedia of Day of Defeat
Left 4 Dead WikiEncyclopedia of Left 4 Dead
SFMLabDownload free models for use in your Source Filmmaker shorts Prefabshosted multitudes of prefabs for half-life
3rdLifevery hard to crawl but was once a great tutorial resource
Valve Developer Unionthe Valve Developer Union’s goal is to preserve the toolset and knowledge for modding Quake-based games, including games built off Valve Corporation’s GoldSrc and Source engines.
Plague FestGreat mapping and modding community
NerdChowCoding tutorial for Half-Life
Weapons of Insurgency 2Weapons of Insurgency 2
Handy VandalDecent oldschool resource for half-life modding
EditLifeOne of the older sites dedicated to mapping and resources. No longer live :(
Half-Life [GameHut]Old site with walkthroughs on half-life
WorldCraft OnlineTool for creating Hammer maps from a 2D perspective
Jinx's MapsGreat little site with some good tutorials and resources on Half-life
LambdaGenerationA great community fan website for all things Valve related with a primary focus on that which is Half life. Gives great exposure for new mods.
Half-Life HQOnce a very busy site for Half-Life
SteamcastGreat collection of Podcasts on everything VALVe
Amphibian ModsAnother great resource for modding, unfortunately lost in Valvetime
HL SpainSpanish blog covering Half-Life 1 Mods
The Mighty AtomGreat little selection of some of the harder to find resources on Half-life
MaxofS2DGifted movie maker and modeler who worked extensively with Source...
The Orange BoxThe Official Orange Box Website
Game EditFew small tutorials on HL1 mapping
Mortal DevGreat website with links to useful resources
HLDS 101Cool resource explaining how to use the Half-Life Dedicated Server
ContaminatedDefacto place for everything half-life around its release. Closed only to re-open as Planet Half-life.
Half Life ExpressOld site for news on Half-Life
Official twitter for CS:GOOfficial twitter for CS:GO
Background RadiationUnfortunately dead, this site provided prefabs back in the day
hlds_linuxOfficial mailing for Half-Life Dedicated Servers on Linux
Team Fortress WikiEncyclopedia of Team Fortress
Half-Life CreationsUseful Community for modding tutorials
Half-Life 2The Official Half-Life 2 Website
HL2 Mods.ruA Russian Mod Review site for Source Games
Dota IIThe Official Dota 2 Website
Half-Life FusionFrench site dedicated to Half-Life
Weapons of Source Film MakerWeapons of Source Film Maker
FacepunchGreat website with plenty of tutorials many of which focus on Garry’s mod but none the less a very useful website
Editing ArchiveThe Archive serves as a gathering point for people interested in games and game development. The Archive has various features to help unite the community, and bring them together.
hlds_announceOfficial mailing for Half-Life Dedicated Server Announce
Half-Life Codingone of the best original resources for Half-Life Coding
Half-Life Editing ResourceSimilar to VERC, decent collection of tutorials here as well as downloads
Garrys BlogFrom the creator of Garrys mod comes Garrys Blog...
When its doneSome tutorials on HL1 development
Half-Life ComicComical take on the Half-Life Universe
Weapons of Firearms: SourceWeapons of Firearms: Source
SlackillerTutorials, textures and maps for Source
Half-Life ProgrammingGreat resource for Half-Life coding
Official twitter for DOTA2Official twitter for DOTA2
hl2modcentralA site that had a wealth of useful tutorials but unfortunately lost.
SourcedcHad some decent Mapping tutorials, Worth a look.
The FixxxerGood collection of coding tutorials here
Weapons of Counter-Strike: Global OffensiveWeapons of Counter-Strike: Global Offensive
HL ImprovementThriving Modding Community
nashalifeRussian Modding site for Half-Life
isolated-design.deA good resource for GoldSrc modding tutorials
69th VlatitudeGood oldschool tuts and resources can be found here
Gaming-Models.deDownload free models for use in your mods
Garry's Mod WikiWiki with useful information for developers and gamers playing with Garry's Mod
Weapons of Team Fortress 2Weapons of Team Fortress 2
HalfLife Control UnitGreat web resource for Half-Life
Official twitter for Valve SoftwareOfficial twitter for Valve Software
Half-Life ArrangementFew small tutorials for Source
Type 3 studiosSource Engine mapping and tutorials
Alien Swarm WikiEncyclopedia of Alien Swarm
ModdbHuge Database of Mods, tools and tutorials, thriving community and useful rating system
Petes PlaceOld coding tutorials
Map CoreLegendary Half-life Based Mapping Resource with a Vibrant community
Weapons of Counter-Strike OnlineWeapons of Counter-Strike Online
hl.loessVery useful list of mods for Half Life
SteamDBRecords all changes to steams games and products
Half-Life Beta ProjectNice little russian site covering Half-Life designed around the old steam colors.
Half-Life: AlyxThe Official Half-Life: Alyx Website
Modding AreaGreat French community for Modding resources.
Weapons of Counter-StrikeWeapons of Counter-Strike
Black MesaBlack Mesa is a re-envisioning of Valve Software's classic science fiction first person shooter, Half-Life. Powered by Source Engine, You will re-visit the inaugural role of Gordon Freeman and his memorable journey through the Black Mesa Research Facility.
Half-Life WikiAnother great wiki covering Half-Life
UbermicroCommunity of tutorials on mapping and modding
Planet FortressTeam Fortress Based fan site
Official twitter for TF2Official twitter for TF2
Half-Life PortalGerman site covering Valves games
ChaincraftOlden goldie here with some very useful modding tips on goldsrc
Weapons of Left 4 Dead 2Weapons of Left 4 Dead 2
The SnarkpitHost for maps, tools and tutorials, active community
SRCDSSource Dedicated server resource
Mach IIIDecent site from the old days covering Half-Life
Planet Half-LifeOnce one of the greatest sources for everything HL2, is now shutdown with Gamespy’s closure
half-life.ruActive Russian Modding Community
NetdayMap hosting site including but not limited to Valve Games
MapeadoresSpanish modding Tutorials
Counter-ScriptThe #1 Counter-Strike Scripting Site... now gone :/
Combine OverWikiComprehensive information on Half-life and Portal
Nems ToolsExtremely useful tools for Source modding
Half Life Machinima WikiEncyclopedia of Half Life Machinima
dying2killAustralian & NewZealand based Gaming Community
Half-Life Nostalgia ProjectCollection of screens and info prior to the release of Half-Life. another victim to gamespys untimely demise.
CeskemodyCzech Modding site with both GoldSrc and Source Content
Half-Life.orgSome interesting articles to read here
Weapons of Vampire the Masquerade: BloodlinesWeapons of Vampire the Masquerade: Bloodlines
ModMaticMod review site from the developer of Minerva
Left 4 DeadThe Official Left 4 Dead Website
SDK NutsOne of the older HL2 modding websites
The Razzer TutorialsTutorials for Source mapping (Deutsch)
hl2worldNo longer exists but was once the defacto source of tutorials for HL2 Modding
valvenewsOld site for news on Half-Life
Counter Server MapsAnother unfortunately dead resource that supplied plenty of downloads and tutorials
headcrab.plPolish community dedicated to Half-Life
Ask YahnQuestions put to Valve Employee Yahn Bernier
Half-Life FalloutOne of the better communities for Half-life content
Team Fortress 2The Official Team Fortress Website
HL2SpainSpanish site covering everything Source
RvanhoornHalf-Life 2 Map Editing Optimization Guide
Appalachian Killing GroundsOld site with large collection of tutorials
Official mailing listsAsk questions related to mapping, coding and steam services through each mailing list, view the archives as well!
A Working PigHalf-Life 2 Deathmatch maps and utilities
Alien Swarm:Single Player BlogGreat Blog based on the Single player conversion mod for Alien Swarm
hldsOfficial mailing for Half-Life Dedicated Servers
taz00Some useful source modding tips can be crawled here
GoldSrc GoldExhibiting and preserving the great look and feel of Goldsource engine games & mods from days gone bye.
Persistence of VisionTutorials on creating movies in half-life
Weapons of Half-LifeWeapons of Half-Life
ValvetimeGreat source of news on everything Valve related.
Half-Life DeathMatch GuideGuides for succeeding in HL1DM
Resource CodeOld site with large collection of coding tutorials written in German
HL CollectionRussian Mod hosting site dedicated to Half-Life
Weapons of Counter-Strike: Condition ZeroWeapons of Counter-Strike: Condition Zero
Half-Life Programming Planetplenty of good old tutorials here for Half-Life
HL2 CodingProgramming Tutorials for HL2
Weapons of Day of Defeat: SourceWeapons of Day of Defeat: Source
Halflife2.filefrontHuge collection of downloads for Half Life and Source
Half-Life Mods WikiEncyclopedia of Half-Life Mods
Game BananaOne of the original game modding websites (previously known as FPS Banana)
CS:VelocityOnce another vibrant community from the Counter Strike golden days
VDCThe Valve Developer Community is the official Source SDK Documentation
Left 4 Dead 2The Official Left 4 Dead 2 Website
EGIR.DKProvided a vibrant forum and tutorial collection back in the day
Source RunsSource runs is a great site documenting and supporting community members who attempt record breaking speed runs through GoldSrc and Source Engine games.
Mods InsideRussian Mod community providing forums, files and reviews.
modsentryGreat resource covering popular game mods
Weapons of Day of DefeatWeapons of Day of Defeat
Steam ReviewSite covering interesting facts about Steam
World of Level DesignTutorials on Mapping for many platforms
Half-LifeThe Official Half-Life Website
Podcast 17Another great collection of podcasts on anything steam, valve or source related
Botmans BotsDecent starting point for modding the SDK
Steampowered ForumsThe Original Official Steam Forums
Weapons of Counter-Strike: SourceWeapons of Counter-Strike: Source
Half-Life Beginners guideDecent attempt to make it easier for newbs to come to grips with the SDK
Half Life Saganot useful for modders but a must read for those interested in the half-life Universe
Half-Life WikiEncyclopedia of Half-Life
CITY17.RUAnother unfortunate victim of disregard, was a great site dedicated to everything Half-life.
InterlopersHL2 News, Tutorials and forum with a thriving community
Half-life Coding IndexOld site indexing the coding tutorials available for half-life
WunderboyVery useful Tools and Tutorials for Source Modding
Half-Life 2: Episode 1The Official Half-Life 2: Episode 1 Website
Weapons of InsurgencyWeapons of Insurgency
Half-Life MuseumA good break down of Half-Life and Half-Life 2, unfortunately it is no longer live.
ModDotaGreat resource for modding Dota II
csgo_serversOfficial mailing for CS:GO Servers
Half-Life Physics ReferenceThe Half-Life Physics Reference is a wonderful site with un-official documentation on the GoldSrc Engine.
The WadfatherContains some useful links to tutorials
Halfwit 2HL2 mapping and tutorials, general information
The Weapons Workshopprovided downloads to Hl Models.
VosseyActive French Modding Community
Design 3 (Noesis)Big collection of high quality Source engine tutorials (paid)
Counter MapUseful maps and Tutorials for CS 1.6 and CS:S
Phineas BotBots for Half-Life and tutorials
RadiumOld Map rating and review site
TenFourOnce a great review site.
Arbitrary ImpositionSite dedicated to the Gman and his sightings
Mr Funeral ModsTalented Source Modder with good quality Tutorials
Weapons of Half-Life 2Weapons of Half-Life 2
Half-Life 2: Episode 2The Official Half-Life 2: Episode 2 Website
VERCVERC Collective (Valve Editing Resource Center) website no longer exists but can be traversed on the wayback machine, Predecessor to VDC
HL2DM UniversityHalf-Life 2 Deathmatch based community resource.
pcosmos.caCollection of Half-Life and Opposing Force Mods
hlcodersOfficial mailing for Half-Life Coders
Half-Life 2 ModsA collection of all known mods for HL2
Mapping BaseGreat German community for Mapping resources.
WallwormModeling tools for Max
Grinder74Another Polish community dedicated to Half-Life
Run Think Shoot LiveA great community website for all things valve related. Focused on mods, tutorials and the expression of the community. Previously known as Planet Phillip.
WavelengthSource, GoldSrc tutorials, inactive forums, mostly defunct, use the wayback machine to get some missing pages
SourceWikiOnce had some good coding tutorials and offered help, unfortunately lost.
KV File GeneratorOnline tool that automatically generates a formatted .kv file based on your selection for CS:GO
Weapons of Left 4 DeadWeapons of Left 4 Dead
gamewagLinks to plenty of mapping and modding tutorials based on Source
The 303Tutorials for Source
TWHLSource, GoldSrc tutorials, active forums, friendly community
100 Half-Life 1 Mods100 of Half-Life 1's best Mods hand picked by Andrej Mernik
Action Half-LifeUseful maps and Tutorials (use the wayback machine to navigate)
3kliksphilipTalented CSS and CS:GO Mapper with a wealth of Tutorials
Sven Co-opGreat website with a very active community for the Sven Coop Mod
LeakfreeSome useful tutorials on mapping with Source
scmapdbTutorials for Sven Co-op
Weapons of Black MesaWeapons of Black Mesa
ammahlsTutorials for Sven Co-op
HalfLife.netAnother Half-Life website from back in the day
Level Design TheoryBlog documenting single player map creation for Half-Life 2 and other Source Games
Half-Life LibraryThis site focuses more on user generated content like custom maps, modifications, videos, models, clans and more for all of Valve's games.
Counter Strike: Global Offensive, Counter Strike: SourceThe Official Counter-Strike Website
HL2DBAnother lost site that had some promise back in the day.
Half Life ZoneSmall site for Half life related content
Official twitter for L4DOfficial twitter for L4D
Dota WikiEncyclopedia of Dota
Where is Gordon FreemanThis website is a timeline documenting the range of fascinating events that have happened between Gordon Freeman’s most recent appearance in 2007 and his yet-to-be-announced next appearance in the franchise.
metrocopComics from Source engines games, specifically Garrys Mod.
Thinking with PortalsThe Official Portal Website
ChaosincarnateTools and Tutorials for Source Modding
HLFXActive Russian Modding Community
nextwishOld site with useful info on modding for GoldSrc
Counter Strike WikiEncyclopedia of Counter Strike
The WallGerman Mapping community with a wealth of Tutorials
Texture StudioOld texture resource for Half-Life, contains some tutorials
tophattwaffleExcellent tutorials on Source mapping
Counter-Strike PlanetGreat old mapping resource for Counter strike.
Half-Life SDK2 ResourcesGood site for getting up and running with the old SDK
No DrawGreat Blog detailing concepts when it comes to TF2 map creation