most of the mods are still/hopefully under development and some sites are temporary down

As for the "HL-2: Zombie hunter"-mod, its out and can be downloaded here:
Half-Life: Zombie hunter
Zombie Hunter v0.7
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http://www.gamershell.com/download_7017.shtml
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http://www.gamershell.com/download_7018.shtml
a nice overview about Hal-Life mods i found here:
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http://en.wikipedia.org/wiki/Half-Life_2_mods
Half-Life 2: Cause and effect
homepage/screens:
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http://cae.hl2files.com/
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http://www.hlportal.de/?sec=mods&site=mods&do=showmod&mod_id=253
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http://www.deadmod.com/?s=home
screens:
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http://www.hlportal.de/?sec=mods&site=mods&do=showmod&mod_id=215
...most of the mods i found through google-picture-search today.I entered "zombie" + "mod" and *volia* nice mod pictures


name: Four Horsemen of the Apocalypse
game development status: canceled
developer: Brat Designs Ltd./ 3DO Company, the
release land: UK
announced release date: 2003
genre: 3D-action, shooter, hack 'n slay, fantasy, horror
perspective: 3rd-Person
Info/videos/screens:
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http://www.3dgamers.com/games/fourhorsemen
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http://www.ag.ru/files/videos/four_horsemen_of_the_apocalypse/p1/#1023
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http://pc.ign.com/articles/375/375785p1.html