Looking For A Good Hl Mod

I am looking for a good Half-Life mod other than Counter-Strike and Day Of Defeat. Please state if its multi or single player.

Thanks

-Someone

Both of these are multiplayer.

http://www.specialistsmod.net/
Copy of the matrix.

http://www.natural-selection.org/

Quote:

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Multiplayer-only Half-life mod where one team plays marines and the other plays aliens. The humans must keep their cool and work together to assault an alien-infested spacecraft or colony. Marines vs. marines and aliens vs. aliens scenarios will also be supported in the near future.

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WormsHL is cool. if youve played worms armageddon.
http://wormshl.com/

Haha, that's an anagram of omrwlsh.