Screeps: World

Screeps: World is an open source MMO RTS sandbox game. With all the attributes of a full-fledged strategy game, you control your colony by writing script that operates 24/7 in the single persistent open world filled by other players on par with you. Your colony can harvest resources, build units, conquer territory, trade with other colonies. As you conquer more territory, your influence in the game world grows, as well as your abilities to expand your footprint. But beware, multiple players aiming for the same territory may lead to conflict!