Halflife2.net features information about all Valve titles, as well as the largest Valve forum community outside of Steam. It is a good resource for news and general information about the games, and the community can answer most Half-Life related question. The site is hosted and supported by Valve themselves.

HD Games is a Valve games community in Argentina. HD Games es una nueva comunidad en Argentina, sobre los juegos de Valve(CSS,TF2, etc). tiene un espacio de foro y servidores propios, ademas de una muy buena respuesta a la hora de opinar sobre como mejorar la pagina y los servidores.

HL Gaming covers all the news related to Valve gaming, including TF2, L4D and all your HL favourites.

Half-Life Portal is the biggest German website for Half-Life games, mods and other games from Valve. This web-portal has a community with forums, many news, articles, downloads and informations regarding most of Valve’s games, as well as Steam and third-party Source Engine games.

HL Spain is a Spanish community for all Valve’s Half-Life games and mods, such as Counter-Strike, Day of Defeat or Team Fortress Classic. You can find previews, reviews, tutorials and news for everything related to HL and GoldSrc.

HL2Spain is a Spanish fan-site and gaming community covering everything about the Steam Platform, Valve Games, and Source Engine based Games & MODs. It includes news, reviews, previews, manuals and tutorials done by their team and the community itself.

Interlopers has been online since 2004. It posts selected Steam game news but its focus is on content creation.

L4D.es is a website and Spanish Community dedicated to Left 4 Dead. Pagina web de Left 4 Dead en Español.

L4D Inside is a Russian L4D portal.

Mod DB is the largest website dedicated to supporting independent development of games

Nana’s Paradox covers Source games and runs articles and news about maps and mods.