The Battle for Wesnoth - The Battle for Wesnoth is a turn-based tactical strategy game with a high fantasy theme.
ANNO - ANNO is a city-building and economic simulation video game series, with real-time strategy elements.
Advanced Strategic Command - Advanced Strategic Command is a free, turn based strategy game.
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Tanks of Freedom - Classic turn-based strategy game with two armies fighting against each other.
The Settlers Online - The Settlers is a free web browser based strategy game along with a gameplay that drops anywhere between Age of Empires and the online strategy style.