[Nikkan]

Updated 6/3
All of these are in english and 100% free

Ether Saga
http://eso.perfectworld.com/

Spoiler for pictures:

Holy Beast Online
http://hb.getamped.com/home

Spoiler for Pictures:

DOMO (Dream of Mirror)
Europe only: http://www.gametribe.com/gt/domo.do
Everyone else: http://domo.aeriagames.com/

Spoiler for Pictures:

LaTale
http://latale.ogplanet.com/main.og

Spoiler for Pictures:

S4 league
http://s4.en.alaplaya.net/

Spoiler for Pictures:

Trickster
http://trickster.ntreev.net/

Spoiler for Pictures:

Scions of Fate
http://fate.netgame.com/

Spoiler for Pictures:

Seal Online
http://sealonline.dontblynk.com/

Spoiler for Pictures:

Wonderland Online
http://wl.igg.com/

Spoiler for Pictures:

Dragonica
Europe: http://en.dragonica.gpotato.eu/ad/
Everyone else: http://dragonica.iahgames.com/

Spoiler for Pictures:

Grand Fantasia
http://grandfantasia.aeriagames.com/

Spoiler for Pictures:

Bright Shadow
http://brightshadow.gamepotusa.com/

Spoiler for Pictures:

Mabinogi
EU: mabinogi.nexoneu.com
US: mabinogi.nexon.net

Spoiler for Pictures:

Dungeonfighter
http://dungeonfighter.nexon.net

Spoiler for Pictures:

Florensia
http://en.florensia-online.com/

Spoiler for Pictures:

Fiesta
http://fiesta.outspark.com/

Spoiler for Pictures:

Lunia
http://global.lunia.com/

Spoiler for Pictures:

Cloud 9 (Holic 2)
http://cloudnine.netgame.com/

Spoiler for Pictures:

LUNA online
http://luna.gpotato.com/

Spoiler for Pictures:

Monato Esprit
http://www.monatoesprit.com/

Spoiler for Pictures:

Emil Chronicle
eco.runup.com.sg

Spoiler for Pictures: