Reality Factory

Sounds fun ,I'll try it

Hey...arent you using a free model I posted a while ago? lol, but in any case, dont do it. I suggest getting a microphone, covering it with something (like a cloth) and make moaning/screaming sounds. After that, go download a sound remixer and edit it to your liking.

Easy and legal.

[EDIT] oops. I didnt see that last post.

if you're talking about the gameplay video,it's not from my game.My game is a sCi fi action and...there were a lot of zombies,but I decided to remove them actually,so now there are the aliens and the bad guys who will cooporate with the aliens.

I agree with paradoxnj and Kiji8989, just get a microphone and audacity.
I use Audactiy a lot to edit sounds, and convert them.
To make a cool echo-ish zombie moan, aim the microphone into a metal bowl and moan into the metal bowl (never mind how foolish you may look) then adjust as you wish.
And that is that!

An aluminum trash can is your friend.

Might try seaching Soundsnap.

thanks guys,I removed the zombies from my game ,there will be only aliens...some kind of insects maybe and people (bad people,good people and civillians :D:D ).But aliens....zombies...insects (no..not insects ) they all sound alike,so I'll take your suggestions,and thanks for the link,Allanon!