i'm bored. i dont know what sort of game i want to buy.
Just recommend me something :/
Also what is the largest game in gb that you can get from gog.com?

Jagged Alliance series.

DarkStar One takes up the most space so far at 4.1GB, can't say I recommend it though, you would be better off with freespace if you want a space sim.
Without knowing what sort of games you enjoy its a little hard to recommend anything. I played through Beyond Good and Evil recently and enjoyed it alot though.

Got all the jagged alliance games when they were released apart from the ja2 expansion pack

Get the Freespace games. They're beyond awesome.
EDIT: OT:
FUCK YEAH, DEATH!

Another vote for the Freespace series. It is divine.

I recommand some game people never talk about enough :
FreeSpace...
Make sure you use all the OpenSource bonus stuff, including MUCH improved graphics (high resolution) :
http://www.hard-light.net/
http://www.hard-light.net/wiki/index.php/Main_Page

I was gonna say "Freespace," but everyone else has already trodden that path, and I'd just look like a bandwagon-rider if I still recommended it. So...
Gothic!

Without any sort of information we're shooting blind. Recommend you a game because you're bored? Just get anything from the catalogue then. Lots of reviews there too.
Games you already have can tell people what you've liked and people can recommend similar stuff that you won't have. Genres you feel like playing or what are you up to right now also helps. You feel like shooting things at random or like thinking a little bit? Feel like being immersed in another world or something simpler and quicker?
I recommend Original War. Not if you just want to kill a couple of minutes though.

Hmm, lets see...
Broken Sword if you want a good adventure
Beneath A Steel Sky if you want a good FREE adventure
In Cold Blood if you want a good adventure with guns and a few robots
Freespace 2 (with the FS2Open mod) if you want some awesome space sim shooties and have a joystick
Duke Nukem 3D if you want a generic shooter that's rampantly overrated
Evil Genius if you want a management sim that gives you a laugh
Fallout if you want Fallout
Far Cry if you want a pretty and interesting shooter that gets kind of shit and stupid towards the end
IL2 if you want one of the best combat flight sims ever made and have a joystick (you can just get away with flying by keyboard in Freespace, there's no chance in IL2)
Oddworld: Abe's Oddysee of you want a good platform game with a sense of humour
Prince Of Persia: The Sands Of Time if you want the single most polished and classy game on GOG
Spellforce Platinum if you've ever wanted a middle point between RPG and RTS with cover art that shows a LOT of sideboob
Rainbow Six if you like heavily tactical shooters where half an hour of planning can be ruined in a second if you forget to enter a room carefully and end up with a bullet in the face
There you go, that should give you a few to think about
As for the size, wasn't there a 5GB game here? Or was that one of the racing games that was recently pulled?

Spellforce Platinum
Tex Murphy UAKM
Yep, 5.3GB, TOCA RD3.

Get The Guild and be bored no more!

Duke nukem, fallout, Jim, darkstar or just giantz kabuto. All classics.

May be the best game on the site.

Unreal Tournament 2004. Just got it today and cant stop fragging.

I'm in the mood to recommend Descent 1+2.
So, get Descent 1+2.