Open-source textbooks
- CK12.org - physics, biology, calculus, engineering and more
- General Chemistry Virtual Textbook, Stephen Lower
- Chemistry Grades 10-12 Free High School Science Texts, by FHSST Committee
- Concept Development Studies in Chemistry, John Hutchinson
- Quantum States of Atoms and Molecules, Hanson, Zielinski, Harvey, & Sweeney
- Basic Principles of Organic Chemistry, Roberts, John D. and Caserio, Marjorie C. (1977)
- Intro to Organic, William Reusch
- College Cram Chemistry Wiki, topical
- Scholarpedia (peer-reviewed wiki)
- Textbook Revolution (general resource)
- Flat World Knowledge Publishing (general resource)
- Making Textbooks Affordable (general resource)
- CCCOER (general resource)
- Curriki (general resource)