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.

Headcrab.pl is a Polish website that covers most of Valve’s newer games.

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 Site is a Russian portal for some of Valve’s games.

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.

HL2World.com is a news and forum based site that has been around for a long time. The forum is particularly active.

LanManiaX2 is a map and mod resource. But don’t let that simple description fool you, it contains a wealth of news and information.

Map-Factory is a database hosting custom maps for any FPS. If you’ve make a map or simply came across a good map, feel free to submit it! If not, then just navigate through the site and you’ll find a lot of good maps!

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

Netday is dedicated to custom maps of high quality only. Maps are added regularly (at least one per week). It also covers mods like Dystopia, Portal Prelude and JailBreak. The map reviews are both in English and in French. It is advert free and features direct download to all files.

SLUM is Czech Steam community and fan portal about Steam and Valve games.

Steambans.com is a global banlist/watchlist made for the Steam technology from Valve. All bans that are accepted will enter a database which then is used to protect all servers under their supervision.