TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.

Realm of the Mad God - Realm of the Mad God is a best online hack and slash video game that includes pixel style graphics.

Warlight - Warzone is a customizable Risk-like strategy game where you compete with your friends to conquer the world.

Stendhal - Stendhal is an Action-Adventure, Massively Multiplayer Online, Role-playing, Browser-based and Fantasy-themed video game that provides you with old school visuals style.

Domination - Domination is a game that is a bit like the well known board game of Risk.

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.