Black Mesa Source

Description;
Black Mesa is a Half-Life 2 total conversion remaking VALVe Software's award-winning PC game, Half-Life. Utilizing the Source engine, Black Mesa will reintroduce the player as Doctor Gordon Freeman, along with the original cast of memorable characters and environments seen in Half-Life. Black Mesa was founded to fully reconstruct the Half-Life universe utilizing Source to its fullest potential in terms of art detail, level sizes and code features. This total conversion will not require Half-Life: Source to play - only legitimate copies of Half-Life 2 and Counter-Strike: Source on Steam.
NOTE: Not to be confused with Half-Life: Source -- this is an enhanced remake built as a total conversion of Half-Life 2.

Features:

Detailed and interactive environments based on the original Half-Life game, including reconstructed multiplayer maps
Single-player, co-operative and deathmatch modes planned
Original music score by Joel Nielsen
Artificial intelligence that will dynamically think, react and interact with and about their environment
Normal, specular and parallax mapping utilized on world surfaces and models where applicable
A priority on gameplay and immersion factors such as ambience, logical functionality and interactivity