This free calculus textbook from Boundless Learning is based off openly available educational resources such as "government resources, open educational repositories, and other openly licensed websites." The textbook...

The Calculus Page is operated by the Department of Mathematics at the University of California, Davis. Although it gives links to many other online calculus resources, the site has excellent material of its own that is...

Interactive Real Analysis is an online, interactive textbook for Real Analysis or Advanced Calculus in one real variable. Organized into the topics of sets and relations, infinity and induction, sequences of numbers,...

Few calculus resources, either online or offline, can match the sheer depth and user-friendliness of Karl's Calculus Tutor. The site contains educational material that is covered in a standard introductory calculus...

Linked essay describing the history of Calculus from the Greeks through Newton and Leibniz, with 28 references (books/articles).