Digital library
Textbooks, references and open learning resources.

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MAT 2410: Calculus (Open Stax)
Jaison Novick · Prince George's Community College
In the contents: 2.02: A Preview of Calculus · 5.03: The Fundamental Theorem of Calculus

External
Multivariable Calculus Text (Supplement to Open Stax Text)
Karla Westphal · Saddleback College
This is a supplement to OpenStax Calculus V3. It is meant to substitute for section 4.2, limits of functions of more than 1 variable, placing less emphasis on using the definition directly and more on techniques like substitution, changing coordinate systems, and paths.

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First Semester Calculus (Westphal, adapted from Open Stax)
Karla Westphal · Saddleback College
In the contents: 2.01: A Preview of Calculus · 4.06: Using Calculus (and some algebra too) to graph functions · 5.03: The Fundamental Theorem of Calculus

External
MATH 25: PreCalculus (Abramson OpenStax)
Jennifer Moorhouse · Hartnell College
In the contents: 07: Introduction to Calculus · 7.00: Prelude to Calculus · 7.01: A Preview of Calculus