It's been a good run for true horror games lately. Amnesia scared people's socks off, Slender is doing much the same, and now we've got an update to Cry of Fear, one of the 10 lucky games to have been "greenlit" by Steam earlier today.
Cry of Fear is a total conversion mod for the original Half-Life, which replaces absolutely everything in Valve's game with new content. While the age of the engine means some aspects of the game are a little janky, the developers have still done a great job with things like lighting and music to make Cry of Fear genuinely tense.
An update for the game was released last week. You can grab it from the link below.
Cry of Fear [ModDB]