http://arstechnica.com/gaming/news/2008/12/play-crysis-wars-free-for-ten-days.ars
Christmas is the season of giving, and EA is getting into the holiday spirit by offering ten free days of Crysis Wars, the multiplayer suite from Crysis Warhead. From December 19 to December 29, you'll be able to give the game a try, along with the new holiday map pack that will be released this week

Where do I download?

http://arstechnica.com/gaming/news/2008/12/play-crysis-wars-free-for-ten-days.ars
Christmas is the season of giving, and EA is getting into the holiday spirit by offering ten free days of Crysis Wars, the multiplayer suite from Crysis Warhead. From December 19 to December 29, you'll be able to give the game a try, along with the new holiday map pack that will be released this week

Where do I download?

There are no more holiday trials, that one is from two years ago. Unless you have a valid CD-Key already, the download is pointless.

Anyway, here is the download:

http://www.fileplanet.com/192494/190000/fileinfo/Crysis-Wars-Trial-

Then download Crysis Wars Patch 1.5 from here:

http://www.gamesas.com/download

Only works if you have a valid CD-Key.

Link is an article from '08

Close to "free" is here:

http://store.steampowered.com/app/17300/

no longer available, some of my friends got it in time though
I already have it since day 1

no longer available, some of my friends got it in time though
I already have it since day 1

Still there but now 14,99 €uro's for "Buy Crysis? Complete Pack".
"Includes 2 items: Crysis, Crysis Warhead?"

:)