I do not have the skills to program the mods, but if anyone does I could work with you on the art/information/etc for the following civilizations. Each of these civs has had a major impact on the world in one way or another and (to my knowledge) none have appeared in any incarnation of Civ.
Crete
Leader: Minos
Trait: Strength of the Minotaur (+25% combat bonus when defending)
UU: Argo (Replaces Trireme, additional +1 to ranged strength, movement, and sight)
UB: Labyrinth (Replaces Colosseum, additional +2 happiness)
Moundbuilders/Hopewell
Leader: Great Sun
Trait: Early Innovation (+2 production per city until Engineering)
UU: Big Man (Replaces Warrior, additional +2 combat strength)
UB: Mound (Replaces Monument, additional +1 culture and +1 happiness)
Ethiopia
Leader: Haile Selassie
Trait: Scourge of Colonialism (Cities receive +4 defense bonus)
UU: Spear Thrower (Replaces Crossbowman, additional +3 to ranged strength)
UB: Oasis (Replaces Garden, improves from +25% Great Person bonus to 33% Great Person bonus)
Israel
Leader: David
Trait: Jewish Cunning (Tiles adjacent to river or coast generate additional 1 gold per turn)
UU: Slingman (Replaces Archer, additional +1 to range)
UB: Synagogue (Replaces Opera House, additional +1 culture and +2 gold per turn)
South Africa
Leader: Nelson Mandela
Trait: The Great Uniter (Happiness from buildings doubled)
UU: AK-47 (Replaces Infantry, additional +4 to strength and 25% combat bonus in Open territory)
UB: Prison (Replaces Workshop, improves to +33% prod. to buildings, with a penalty of -1 culture and -1 happiness)
Thoughts/Opinions?
Crete
Leader: Minos
Trait: Strength of the Minotaur (+25% combat bonus when defending)
UU: Argo (Replaces Trireme, additional +1 to ranged strength, movement, and sight)
UB: Labyrinth (Replaces Colosseum, additional +2 happiness)
Moundbuilders/Hopewell
Leader: Great Sun
Trait: Early Innovation (+2 production per city until Engineering)
UU: Big Man (Replaces Warrior, additional +2 combat strength)
UB: Mound (Replaces Monument, additional +1 culture and +1 happiness)
Ethiopia
Leader: Haile Selassie
Trait: Scourge of Colonialism (Cities receive +4 defense bonus)
UU: Spear Thrower (Replaces Crossbowman, additional +3 to ranged strength)
UB: Oasis (Replaces Garden, improves from +25% Great Person bonus to 33% Great Person bonus)
Israel
Leader: David
Trait: Jewish Cunning (Tiles adjacent to river or coast generate additional 1 gold per turn)
UU: Slingman (Replaces Archer, additional +1 to range)
UB: Synagogue (Replaces Opera House, additional +1 culture and +2 gold per turn)
South Africa
Leader: Nelson Mandela
Trait: The Great Uniter (Happiness from buildings doubled)
UU: AK-47 (Replaces Infantry, additional +4 to strength and 25% combat bonus in Open territory)
UB: Prison (Replaces Workshop, improves to +33% prod. to buildings, with a penalty of -1 culture and -1 happiness)
Thoughts/Opinions?