Black Mesa Source

Black Mesa (previously known as Black Mesa: Source) is a third-party total conversion mod for Half-Life 2. 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, the improved graphics quality of Half-Life 2 and enhanced character AI, to create a new and more engrossing in-game world by introducing more varied, complex environments and more challenging, realistic gameplay. Black Mesa will be playable by anyone who owns any Source engine game.