Maplestory - MapleStory is among the most popular of MMO in the 2D area scrolling style offering a user count will into the lot of players.
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Path of Exile - Path of Exile is a free to play online action roleplaying game that draws clear inspiration from Diablo but charts a path all its own.
Warlight - Warzone is a customizable Risk-like strategy game where you compete with your friends to conquer the world.
Dungeon Fighter Online - Dungeon Fighter Online is a Free-to-play, Massively Multiplayer Online, Role-playing, Action-Adventure, Hack and Slash, and Fighting video game created and published by Neople.
Domination - Domination is a game that is a bit like the well known board game of Risk.