Cry of Fear does not require Half-Life to be installed. It’s completely stand alone as a full game, and it’s completely free!
Cry of Fear is a psychological single-player and co-op horror game set in a deserted town filled with horrific creatures and nightmarish delusions. You play as a young man desperately searching for answers in the cold Scandinavian night, finding his way through the city as he slowly descends into madness.