Cyber Monster is a free to play 2D browser mmorpg similar to pokemon.

There’re an array of pets to select and mounts to ride in the game. The turn-based gameplay features cute monsters, stunning skill effects, flying mounts, raising pets and much more.
__________________________________________________________________________________________
Genre: MMORPG Status: Final
Graphics: 2D Official Site: http://monster.game321.com/

Drakensang Online
Drakensang Online is a free to play 3D action RPG game...
Adventure Quest Worlds
Adventure Quest Worlds is a free to play 2D browser MMORPG...
Special Offers: Item keys, Beta Keys Giveaway, Gift Key, etc.
lootxp
Top 10 Free Browser MMORPGTop 10 Browser Based GamesThe Best no download MMORPG (browser Based MMORPG)