General Reference
Eric Weisstein's World of Scientific Biography - Site can be searched by field, scientist, gender, minority status, nationality, historical periods or prize winners.

Renaissance Scientists
Galileo Galilei

Galileo Project Rice University's Project about the life of Galileo. Some interesting info about his family and inventions

Renaissance Scientists - Galileo, da Vinci, Vesalius, Copernicus, Gilbert, Brahe, Bruno, Bacon, and Kepler.

African American Scientists
All Info_About Science for Families - Biographies and links.

4000 Years of Women In Science - Extensive work searchable by time frame or field of study

Anthropology Biography Website - Brief descriptions of anthropologists and other scientists that have direct influence on the discipline of anthropology.

Inventors
Inventors - about.com's Inventor's Sites.

Mathematicians
Mathematicians of the African Diaspora - Blacks in mathematics.

Biographies of Women Mathematicians

MacTutor Historical Female Mathematicians - Biographies of mathematicians alphabetical order.

MacTutor History of Mathematics Archive - Biographies of mathematicians throughout history