LibreTexts is an online repository of OER textbooks. It is a massive, collaborative project to "liberate" textbooks. Their Chemistry and Physics libraries are extensive, covering everything from introductory mechanics to specialized topics like Solid State Physics.
✅ Instant PDF/ePub downloads ✅ Mobile & tablet friendly ✅ Updated weekly with new titles ✅ Full rights-respecting content (public domain, open access, or author-permitted)
Use your e-book alongside simulations (like PhET) to see the concepts in action.