Free textbooks & open courses

Everything here links to legally open catalogs — no piracy, no paywalls we bypass. Filter by subject or type, or search by keyword (e.g. “calculus”, “biology”). Informational only. Confirm each site’s licence and attribution rules before you reuse or redistribute materials.

Showing 5 of 5 in this view.

• textbooksSTEM

  CK-12

  Free, standards-aligned STEM flexbooks and adaptive practice — strong for algebra, physics, and chemistry basics.

  Open resource
• repositoryHumanities

  Europeana

  European cultural heritage digitized collections — art, history, music, and archival material for humanities work.

  Open resource
• textbooksGeneral

  Open Textbook Library

  Peer-reviewed open textbooks you can adopt or browse by subject — strong for intro courses (calculus, chemistry, writing).

  Open resource
• textbooksGeneral

  OpenStax (Rice)

  Free, peer-reviewed textbooks — Biology, Physics, Sociology, Economics, and more.

  Open resource
• repositoryGeneral

  OER Commons

  Search millions of openly licensed teaching and learning materials.

  Open resource

+15 more directory links in full hub — earn via rank, three active friends, or coins.