O A.D is a free, open source, cross platform, Real-time Strategy (RTS) game. Its about the ancient warfare and is the open source clone of Age Of Empires!
From the Wildfire games official site we can find that its a historical-based war/economy game that allows the players to relive or rewrite the western civilizations between 500BC to 500AD.
A group of enthusiastic game developers have developed this game. High detailed artwork, state of art 3D graphics, good sound quality and flexibility are some of its features. It has multi player option too.
System requirements : 1