From GameWatcher: “World War Z is out now, and it’s a tremendously fun co-op zombie-fighting game that feels like a successor to Valve’s classic Left 4 Dead series. The game’s developer Saber Interactive was very much inspired by Left 4 Dead, and are fans of Valve’s other famous series Half-Life as well – which according to CEO and co-founder Matthew Karch, Saber actually tried to remake.”
Source: N4G PC World War Z studio tried to do a Half-Life 2 Remake