Seeds of War is a tabletop miniatures wargame which allows you to play out battles between massive sci-fi armies. The rules cover the movement, morale, and combat of infantry, armor, artillery, aircraft, as well as giant warmachines. The rules can be used with any 6mm sci-fi miniatures but are designed to be used with Dark Realm Miniatures which feature several armies each possessing a unique play-style based on the force's strengths and weaknesses.
The Seeds of War rule-set as well as army lists for the various armies can be downloaded for free at Dark Realm Miniatures website.