Free Calculus Textbooks

By Xah Lee. Date:
By Xah Lee. Date: . Last updated: .
Integral approximations
Integral approximation. image source

Here's a collection of calculus textbooks. These are top quality, and legally free.

APEX Calculus by Gregory Hartman et al

Calculus Volume 1. OpenStax project

Calculus, by Jim Fowler, Bart Snapp

If you have a question, put $5 at patreon and message me.