0 A.D.

0 A.D.

0 A.D. (pronounced "zero ey-dee") is a free, open-source, cross-platform real-time strategy (RTS) game of ancient warfare. In short, it is a historically-based war/economy game that allows players to relive or rewrite the history of Western civilizations, focusing on the years between 500 B.C. and 500 A.D. The project is highly ambitious, involving state-of-the-art 3D graphics, detailed artwork, sound, and a flexible and powerful custom-built game engine.

Minimum system requirements: 

Processor: 1 GHz Intel or x86 compatible
Memory: At least 512 MB
Graphics Card: Any supporting OpenGL 1.3 with 3D hardware accelerated drivers and at least 128 MB memory, e.g., Radeon 9000, GeForce 3, or similar
Screen resolution: 1024×768 or above