The modders behind Black Mesa (originally Black Mesa: Source) spent around 15 years remaking Half-Life in Valve's Source engine. It was a massive and ambitious undertaking, and it was—to borrow a line from another Valve game—a huge success. While Black Mesa sticks to the structure of Half-Life it also expands the game, adding far more detail and drama, and even redesigning many of the levels. It's both a worthy tribute to and a masterful reimagining of the classic sci-fi shooter...
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Half-Life remake Black Mesa is getting a remake… in the original Half-Life engine
Source: PC Gamer (opens in a new tab)