Superpowers; Combined civ bonus mod
Civs share the bonuses and unique techs of 3-4 other civilizations, grouped by region
(Applies to unique upgrades like imperial camel and imperial skirmisher as welll, applies to naval unique units, does not apply to unique units. Tech trees not changed)
Unique techs of other civs in category become available in town center after building a castle.
CIVS GROUPED BY BONUSES THEY SHARE
Mediterranean
Italians
Spanish
Portuguese
Byzantine
Middle eastern
Saracens
Indians
Persians
Turks
Western Europe
Franks
Celts
Britons
Central Europe
Teutons
Vikings
Goths
Eastern Europe
Magyars
Bulgarians
Slavs
Lithuanians
East Asian
Koreans
Chinese
Japanese
South-East Asian
Vietnamese
Burmese
Malay
Khmer
African
Berber
Ethiopian
Malians
Nomadic
Huns
Tatar
Cumans
Mongols
American
Aztecs
Mayans
Incas
*unique techs that affect only unique units are excluded, such as Logistica, Royal Heirs,Bearded axe
https://www.ageofempires.com/mods/details/16675
That not enough?
Try Team Civ Bonus Mod
https://www.ageofempires.com/mods/details/16677
All the civilizations on your team share the same bonuses
So for example Byzantine player on a team with Franks and Cuman team gets 192 HP Paladins, can build 2nd tc in feudal age, free farm upgrades, and faster cavalry. Fun to experiment with
These are party mods, naturally they aren’t balanced 
Have fun! I made the first mod on HD a few years ago