Stumbled onto this website a few hours ago and was very impressed by what I saw, considering this is an indie procution.
The game is called 0 A.D and is split into two parts, from 500 B.C to 1 A.D and from 1 A.D to 500 A.D, it seems to be quite well researched and well made, though it is yet to be released. It includes six civs, changingseasons, regions and provinces and a powerful map editor.
http://wildfiregames.com/0ad/
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