Chain Studios is a Russian development studio, that creates mods for Half-Life

City 17 is a Russian review site for single player maps and mods.

Half-Life Inside is a HL community for Russian speaking fans.

HalfeR is a Russian fan-site, specialized on Half-Life, Half-Life 2, Episodes, addons like Blue Shift, Opposing Force and huge modifications like Black Mesa: Source and so on. The site contains news, previews, reviews, interviews, screenshots, patches, etc. fixes about the games.

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

L4D Inside is a Russian L4D portal.

SteamPowered is the home of Steam, a digital distribution platform. The website offers visitors the ability to buy and download games, interactive with other Steam users.

It might seem strange to add Wikipedia to this directory but it contain some very useful information for Valve’s fans. The sections on the games are very detailed. It is also available in many langauges.