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Probably the best Lord of the Rings strategy game in existence currently. The Total War formula almost seems like it was made for Middle Earth.
An excellent game in its own right, Black Mesa beautifully captures the original atmosphere and feel of the original Half Life with many improvements. A word of caution, however: the game is not finished, nor will the free version ever be finished. Check out Steam for the definitive, paid-for (though still incomplete) version of the game.
Epic game with epic atmosphere. A little buggy with occasional crashes, but marvelously fun when it works.
This is what Battlefield 2 tried to be! This mod by itself rivals certain AAA titles that I can think of: Arma, Insurgency, etc., and almost beats them all. It's not exactly pretty looking, but you can't beat it for realistic gameplay.