This trainer has been made for Crysis 2.
It should support most game versions, tested with the first release.

Trainer download link:
Crysis 2 +4 trainer

First run the trainer.
Then run the game. (You can start the game with it's own icon or You can use the Start game button in the trainer.)
Hit number keys on the numerical keyboard to turn options on/off. Make sure that NumLock is active.
You can also use the checkboxes to enable/disable the options.

There are 4 options in this trainer:

1. Unlimited Energy
2. Unlimited Ammo
3. Unlimited Health
4. Unlimited Health 2
5. Unlimited Nano Catalyst

NOTES:
Unlimited Energy: This cheat will give you more energy than the max, so things that would deplete your energy instantly will not deplete it. For example you can keep firing and remain in stealth, or use powered melee attack without draining your energy etc.

Unlimited Ammo is working for the enemies too.

Unlimited Nano Catalyst: Turn on the cheat before you pick up or use Nano Catalyst, you will get 999999, then turn off the cheat.
For example:
1. Kill any alien, turn on the cheat, pick up the catalyst, turn off the cheat.
2. Turn on the cheat, buy an upgrade, turn off the cheat.

Unlimited Health: There are 2 Unlimited Health cheats in the trainer. Both of them are working but you need to use only one. I just added both because if one of them is not working with new versions, the other may still be good. A backup cheat doesn't hurt.

Additional NOTES:

If you will use some DX11 version or 64-bit version or you just don't want/can't use this trainer, download the Cheat Engine table from here and it will work:
Crysis 2 CE table
http://forum.cheatengine.org/viewtopic.php?t=534432

You will need Cheat Engine 6.0 or higher to use this cheat table.

Known bugs:
If you use the "Unlimited Health 2" option, at the very end of the game, when you are crawling in the spire, turn off the cheat or the ending sequence will not start.

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For more trainers or possible updates, check out http://www.szemelyesintegracio.hu/cheats

Some information about virus reports for trainers generally. Read it before You post something about some virus.
http://szemelyesintegracio.hu/cheats/41-game-hacking-articles/212-trainers-and-anti-vir-softwares