Black mesa source is a half life 2 mod: is the history of half life 1 but a remake. the project has been begin in 2004 and terminate in the last month of 2009 or the first months of 2010 (alpha mod released)
well this is the trailer
now alpha gameplay
and now something black mesa source stuff to download
Garrysmod.org
and now lets wait for this mod
By gordenfrechmen