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(pronounced "zero ey-dee") is a cross-platform real-time strategy (RTS) game of ancient warfare

It's a historically-based war/economy game that allows players to relive or rewrite the history of ancient civilizations, each depicted at their peak of economic growth and military prowess

Features Completely Free (to download, play, and modify) Open Source (Code under GPL2, Artwork under CC-BY-SA v3) Cross Platform (Windows, Linux, OS X, partial Android support) An Open Source, custom built 3D Engine called Pyrogenesis Historically accurate civilisation buildings, units and names Built-in unit and map customisation tool called Atlas Finely detailed environments with fauna/flora native to each terrain Offline single player mode or LAN/Online multiplayer gaming Mods support (drop in replacements to create new UI and game behaviour)