Normally we don't report on game mods but I think we can make an exception for this one. Black Mesa Source is a remake of the original Half-Life using the Source engine. The developers have done an tremendous amount of work updating textures and models. To learn more about the game and the team behind it, visit http://www.blackmesasource.com.
The mod looks very promising and looks to stay true to Half-Life events while giving it a new coat of paint.