Source:
http://www.cdgroup.org/forums/tbs/civ3/viewtopic.php?t=2845
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Another idea... this is a biggie!
In CIV3 it's possible to give techs to one and only one civilization, they cannot be traded or researched. What I'm suggesting now is that each CIV gets one technology at the start, which gives them one advantage. And I'm saying unique here - no double advantages (not like in CIV traits or UUs)! These techs would be there from the beginning on, but some of the advantages could rely on resources or buildings from later techs to enforce a late advantage.
Some ideas:
Babylon:
Ziggurat - cheap building that gives +1 culture
Phoenicia:
Phoenician Trader - cheap ship 2 transport, better than coracle
Rome:
Forum - cheap courthouse
Assyria:
Gilgamesh Epic - Won that doubles science in city
Minoans:
Quay - small harbor that allows coastal trade and gives +1 trade in sea squares
Germanic Tribes:
Call to Arms - can draft from the beginning on (too powerful?)
Goths:
Gothic Settler - cheaper settler (too powerful?)
Etruria:
Etruscan Pottery - cheaper Granary
Egypt:
Sphinx - Won, 2 non-era techs
Lydia:
Mausoleum of Halikarnassos - Won, 3(?) happy in city
Sheba:
Aqueduct of Marib - Won, free Aqueduct in each city (they really need it!)
Greece:
? maybe a cheaper library...
Persia:
?
Gallia:
?
Scythians:
?
Carthage:
? something with ships or the sea...
Berber:
?
Medes:
?
Israel:
? something biblical...
Hittites:
?
Kolchis:
?
Huns:
?
Dacians:
?
Iberians:
?
Brittons:
? something with druids...