Who is your favourite game developer?

Bethesda would be my #1 if so many games I got from them weren't riddled with bugs in the beginning (seriously how was that game-breaking bug a minute into Morrowind slip past them xD). So, for now, my favorite is Telltale.

Nintendo probably.

Valve
SCS software
NMRiH Team

Microprose (sadly all gone by now)

Puts on a fake mustache, monocle and top hat I dare say old bean that Running With Scissors is the bees knees don't you know.

i'm a fan of whomever hires me.

Once it was Westwood, but sadly it got killed by EA. ._.

Popcap, sadly killed be EA.
Bethesda, because of Dishonored.

Supergiant Games

Bastion and Transistor is just my favourite

Everyone has mentioned the usual suspects: Rockstar and Bioware for AAA, Wadjet Eye, Klei and Supergiant for indie, Telltale for... I dunno.

But no one has mentioned Nival Interactive yet. They're still around, so there's still hope they'll make something great like Silent Storm again though I doubt it.

Re-Logic : Redigit

No one has mentioned DrinkBox Studios? Guys behind Guacamelee! and Tales From Space: Mutant Blobs Attack!

Also Techland for the Call of Juarez series. Not enough westerns these days.

Running With Scissors. Thinking about working for them someday, they're fucking awesome.

Edmund Mcmillen and his partners in crime (BOI, SMB, etc.)
Puuba (Concursion, The Weaponographist)

Invent4 Entertainment

CDprojekt Red

LucasArts (rip)

Definitely id software.

I love the Doom series, the Quake series, the Wolfenstein series, and of course Rage.

I never had a favourite game developer, I just had favourite games :)
Although these days, I could say that my favourite devs are the guys from Artifex Mundi. They make the best HOGs, period. They're pretty damn good at it :)

think i'll have to say Rockstar but i think will change with time as i get to play more games from great devs

no one has said the all might Namco yet

ITT half the people name publishers as their favorite developers.

Valve, but they need to do something soon to keep that place. Preferably with single player mode included

Paradox expect for mass of DLC's and Re-logic they make no dlc and double game size...Again