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Dead Meets Lead (which recently became freeware).

http://deadmeetslead.com/

Not tried it myself and from what little I've read it seems to be very average, but who knows, you might like it?
PvZ is free on xbox.com
Zombie Shooter 1 Steam code:
REDEEMED
Post edited February 15, 2012 by Navagon
Nice Ninja Giveaway, Navagon :-P

Also, noone (specifically) mentioned Nation Red yet, so I'll make note that it is an engaging, visceral and satisfying score-based Robotron-style shooter, with zombies.
my all time favorite is Resident Evil Code Veronica. It kicks major butts!
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Navagon: Zombie Shooter 1 Steam code:
0MRNW-YRDE5-6KIIA
Thanks a bunch!
Metal Slug 3 - you can get infected and play as a zombie as well (only one zombie stage though)
Lollipop Chainsaw oO
Zombie City Tactics: http://secretblender.blogspot.com/2006/08/brains-have-it.html

Not really a zombie game except in name, but more of a simple strategy game.
The S.T.A.L.K.E.R. games are full of zombies. Zombies with assault rifles.

Also Blood - here on GOG.
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real.geizterfahr: Lollipop Chainsaw oO
Sold!
Post edited February 15, 2012 by the_bard
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csmith: On Kongregate: Rebuild - played that for a few weeks

Other more obvious suggestions but that's one that might be a little less known while still quite enjoyable.

Side note: Can't access their site at work so I can't tell if it's still available. Google indicates there is a sequel. I need to check that out when I get home.
There is a sequel. It's quite good.
The Binding of Isaac (it's not a full zombie game but it features zombie-type enemies)

Zombie Attack (part of AGS Bake Sale)

Freeware:

One Night series: One Night, One Night 2: The Beyond, One Night Full Circle)

Madhouse
Post edited February 17, 2012 by Leroux