This is a freely available (Creative Commons licensed) calculus book, covering a fairly standard course sequence: single variable calculus, infinite series, and multivariable calculus. As of the 2011 version, there is a differential equations chapter.

The book has been used by some instructors at Whitman College every year since 2006. In 2011-2012 it is being used at Whitman, Boise State, Northern Arizona, and Western Connecticut State, and at Lowell High School in San Francisco.

Corrections, suggestions and contributions are welcome.  I especially would appreciate donations of exercises. If you use the text for a course you teach, please do let me know.

David Guichard
Whitman College