As for strategy games I wanna to recommend you these free and online ones
Battle Dawn http://gamelist.bbgsite.com/goto/battle-dawn.shtml
Battle Dawn is a game based on strategy, community and skill. Your goal is to ultimately become the strongest leader on earth, supreme to all others. You must learn to use diplomacy, resources and military to aid in your quest for ultimate power.
Supremacy 1914 http://gamelist.bbgsite.com/goto/supremacy-1914.shtml
Supremacy 1914 is a free online multi-player real-time strategy RPG. Power obsession and the hunger for resources have brought the continent to the edge of self-destruction. Form powerful alliances, build your economy, and prepare your nation for the war. Lead your men into battle and become the ruler of Europe!
Shadowland Online http://gamelist.bbgsite.com/goto/shadowland-online.shtml
Shadowland Online is a browser-based social strategy game set in a post-apocalyptic fantasy world, where players must work with each other to conduct war against allied enemies and dark forces that threaten their homeland.
Warflow (HiThere) http://gamelist.bbgsite.com/goto/warflow-_28_hithere_29_.shtml
WarFlow is a RTS war game where you can command your forces and team up with your friends in the Legion to give enemies a bloodbath, and seize their farms and mines. WarFlow is 100% free and no downloads required.