This is a freely available (Creative Commons licensed) calculus book, covering a fairly standard course sequence: single variable calculus, infinite series, and multivariable calculus. There is no chapter on differential equations.
The book has been used by five separate instructors at Whitman over the last two years. The content is stable at this point (which is not to say perfect...); the principal shortcoming at this point, as I see it, is the number of exercises. I am continuing to add exercises as I get the time.
If the bandwidth limit for this site is exceeded, you can also find the book on the Whitman College site, along with the TeX source for the book.
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