Those who were disappointed with official source remake of the original half life game, there is a great news for you. After 8 years of development, the black mesa is finally out. Its a total remake of the original half life game built from scratch entirely with source engine and the results are astounding. Moreover, its free of cost for anyone to play. If you are a fan of half life series, this is a must play game for you. Its an entirely different experience. http://release.blackmesasource.com/
I heard about this a few weeks ago, it looks great! I haven't had time to try it yet, but looking forward to seeing it all again 14 years after the original was released