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Black Mesa Source came out today, and I have not seen a topic about it.

Black Mesa is a remake of Half Life 1, and a mod for Steam's Source sdk 2007
So its free to play.

Soon it will be available on Steam itself, after it has now been Greenlit.

Requirements:
Source SDK 2007
Black Mesa Files

To Get Source SDK 2007:

Get Steam.
Goto Library.
Then click drop down next to ALL GAMES
Then goto Tools.
Then scroll down and install Source SDK 2007

To Get Black Mesa Files:

Goto: [ Register or Signin to view external links. ]
Then bottom right should say download now.
You can download via torrent or site like gamefront.

Once downloaded run installer, and when done it should be in your Steam library.