the total techtree for the age of italy mod. It will show you which techs are available to each civ, what the prerequisites are, what the effects are and where it can be researched.
Some techs still have "?" at the location. Please give your opinion on where you would like to see it.
Comments and feedback at http://aoe.heavengames.com/cgi-bin/aoecgi/display.cgi?action=ct&f=4,6066,,10