Operation Black Mesa

Operation Black Mesa is a source mod Half-Life 2 modification for Half-Life: Opposing Force.

Deatils
A list of features planned for the final release:

» Complete re-creation of all 12 chapters from the original. » Models that push the limits of the Source Engine. » Multiplayer, including Deathmatch and Team Deathmatch with all the original levels fleshed out. » New voices, sounds, and visuals to truly immerse you in the Black Mesa incident. » Level Design tweaks to utilize the advanced physics engine introduced in Half Life 2. » A remixed soundtrack including enhanced music from the original along with all new ones. » Extended Single Player experience, with new areas and new monsters filling in gaps left in the original. » Immersive scenes that make you really feel for the employees of the Facility. » CTF may be included, But not in early releases.