Screeps: World

Screeps: World is an open source MMO strategy sandbox game for programming enthusiasts. You control your colony by writing JavaScript code that operates 24/7 in the huge persistent online open world.

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!