Bushtarion http://www.bushtarion.com/
Bushtarion is a free web-based strategy game in which you get to head up your own gardening company, and ally or war with other companies.Research new technologies and gain access to a massive array of units, ranging from petrol bombers, to terrorists, to snipers, to assassins, to apaches, to androids, to huge robotic tyrannosaurs.Choose from one of five finely balanced technology routes - protestors, thugs, military, robotics or special operations, each with their own unique play-style and set of tactics.Be defensive and develop immensely powerful immobile units like automated sentry turrets and bunkers, defending your land from would-be attackers, or be an all out offensive player and go rampaging through other players land, killing & bribing their staff, and stealing their land for your own crops.
Join or form an alliance and develop vast alliance HQs, working with friends to climb to the top... or alternatively play solo and get help from automatic government defence (such as SAS & Riot Police) if somebody tries hitting you with a vastly overwhelming force.