Black Mesa
Black Mesa was developed in response to Half-Life: Source (2005), Valve's port of Half-Life to the Source engine, which lacked new features or improvements. The project was formed by the merging of two separate teams that wanted to improve on the Source remake, eventually becoming Crowbar Collective. While they had originally targeted a release by 2009, the team realized they had rushed to this point, and reevaluated their efforts to improve the quality of the remake.