EDEE - Empire Deluxe Enhanced Edition
It will be a 4X game based on you starting with one city. There is no era per se but it is for the most part post WW II. You could create a mod for any period.
The econimic modle is very simple. One city supports X number of units. A city not producing something supports more units
No Tech Tree. Both sides play the game with the same units available.
No maintenance cost
You will be able to mod the unit sets and terrain, and graphics.
Modding the AI will also be possible.
Here is a little more about it:
http://www.windingstream.com/ed/EDEE.htm
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