Ancient Mathematicians of Africa http://www.math.buffalo.edu/mad/Ancient-Africa/index.html
Ancient Math Webquest for 6th Graders http://www.saintmike.org/NRamig/Numbers%20Through%20Time%20Webquest.htm
Ancient Math History by Culture (this site is an absolute treasure trove of info)
Mayan mathematics http://www-gap.dcs.st-and.ac.uk/~history/HistTopics/Mayan_mathematics.html
Incan mathematics http://www-gap.dcs.st-and.ac.uk/~history/HistTopics/Inca_mathematics.html
Abacus Links


Number Bases
Mayan Math for Kids