World Conqueror 1945!

TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game. A wide variety of map scenarios have been developed for TripleA (World War II, Punic Wars, Napoleonic wars, etc.) with a variety of rules, units and many options (such as "low luck" which reduces the number of dice rolled making game depend more on strategy).

webDiplomacy is a multiplayer, online version of Diplomacy, the popular turn based strategy game in which you battle to control Europe; to win you must be diplomatic and strategic.

WarLight is a customizable strategy game where players compete against their friends to conquer the world. It can be played for free at http://warlight.net

Landrule is a turn-based strategy game. Similar to Age of Conquest (series) and Risk .

Ironfell is a time travel themed massive multi-player online real time strategy game. Travel back in time to plunder resources from the past, re-build your empire and conquer the stars.

A next generation computer strategy board game. Capture all the enemy Castles to win!

Lux Delux is a game of strategy and domination inspired by the board game Risk. Control your armies to conquer and hold strategic countries on the map. The object of the game is simple: Take over the entire world!

Awesome clone of the beautiful old risk game! Are you ready to rule the world? Smart conquerors for the great turn-based strategy browsergame wanted! Fight against your friends, the iirtw-AI or find some other cannon fodder.