Xigmatek is one of the most prolific Crysis modders around. His latest work is the Gravity Gun a la Half Life 2, check it out: 
 
  

That looks more like the bad-frame-rate-gun, I guess it is cool that it exists but I have no desire to ever use it. 

I think "vortex gun" would be more apt for how it works.  I wouldn't really liken it to the HL2 gravity gun, since it's really just a weapon / toy and not useful as a tool.   
 
I like how it actually affects the explosion particle effects, too, so you see weird, stretched out flames swirling around inside the vortex.  :P 
 
Anyway, cool little creation.  Not something I'd ever want to download and try out as it seems like he's shown everything there is to see of it, and I've already done my share of dicking around in the Sandbox editor.  Too bad NPC's only take damage from blows with physical objects in the game world and can't take damage from falling or ramming into cliffsides ever since one of the patches Crytek put out for Crysis (and of course, this has been the case for Warhead since release).  Would be fun to see him get soldiers into a vortex and toss them up into the air to fall to their deaths horribly (all those ones you see being tossed hundreds of feet away that are still alive will actually take no damage from their fall).

Looks pretty neat, but it kinda breaks the balance of the gameplay what with the unlimited ammo and super-powerful gravity abilities of the gun.  

"Looks pretty neat, but it kinda breaks the balance of the gameplay what with the unlimited ammo and super-powerful gravity abilities of the gun.   "

"Looks pretty neat, but it kinda breaks the balance of the gameplay what with the unlimited ammo and super-powerful gravity abilities of the gun.   "