Black Mesa is a third-party total conversion modification for Half-Life 2 and a remake from the 1998 video game Half-Life. The ultimate goal of the mod is to recreate the original Half-Life from the ground up, using the advanced capabilities of the Source engine to create a new and more engrossing in-game world.

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

Combine Destiny is the home of the Combine Destiny 1 and 2 mods for Half-Life 2.

The Combine Overwiki is a wiki encyclopedia dedicated to the Half-Life universe and its related subjects. Its main purpose is to treat the available content in an intelligent and analytical way, with emphasis on behind-the-scenes material when available.

Empires is a multiplayer Half-Life 2 mod combining first person shooter and real-time strategy.

The Cinematic Mod (CM) is a Half-Life 2 modification, that adds more details and a darker look to the original Half-Life 2 series.

Flesh is a single player Horror Mini-mod for the Half-Life 2 engine.

Geek-Gaming is a French site that mainly seems to cover TF2, with the occaionsal review of Half-Life 2, EP1 and EP2 sp mods.

Grinder74 covers single player maps & mods & other addons for the Half-Life series of games. It’s in Polish.

Half-life2.sk is the biggest and the most active fansite in Slovak and Czech Republic. It contains interviews(Barney’s Tales, Project 9, Get a Life and Epidemic), a Left 4 Dead review and news about mods, Steam updates, and podcasts etc.