Estranged is a great looking adventure horror FPS Mod based on the Half Life 2 Source SDK. It tells the story of a lone fisherman, whose ship is stranded on a mysterious island during a violent storm. This is the first act of 3, with each act lasting around 1 to 2 hours. Throughout the game, you’ll talk to the strange locals, solve physics based puzzles and fight infected/zombies and guards. It’s a great little game, that’s made excellent use of the Source SDK engine.
Download the Beta HERE (requires Steam)