Black Mesa
In development for 15 years, serving as a free mod before transitioning to a full release, Black Mesa is more than just a remaster of Half-Life. It fully re-imagines environments with gorgeous textures, lighting and new objects. Character models and animations are also overhauled. The entire chapter of Xen has been rebuilt from the ground-up and significantly improved. However, beneath all of this, the team at Crowbar Collective has maintained the mystique (and terror) of the original game.