Favorite F2P publisher? I'd have to say either Nexon or Gravity.
I played MapleStory, a product of Nexon or formerly Wizet, for about 2 years. Also spent a little time playing some of their other games like Mabinogi and Dungeon Fighter.
Gravity created Ragnarok Online of which I spent almost 4 years playing on and off. And not to mention that the name Gravity is simply kick a**.
Sadly, as of now, I'm not playing any online MMORPG's due to fear of being too engrossed with it to bother with studying for college. Spring semester is just around the corner, you know. 3nodding