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Open Educational Resources (OER)

American History

The American Yawp

History in the Making: A History of the People of the United States of America to 1877  - 

Documenting the American South - Collections from the University of North Carolina at Chapel Hill, on topics relating to African-American history, the Civil War, and North Carolina regional history.

American Government and US History - Both from the site ushistory.org

Mathematics

Active Calculus (Grand Valley State University) 

A First Course in Linear Algebra (Brigham Young University) 

PreAlgebra, College Algebra, Precalculus - These textbooks are all from the open repository OpenStax.