With iterative texts, powerful annotation tools, rich media support, and robust community dialogue, Affordable Learning Georgia's OpenALG transforms static open textbooks into living digital works.

The Open Educational Resources series collects instructional materials -- from textbooks to syllabi -- by the faculty of the City University of New York.

Contains a variety of open access books in diverse fields, including the sciences, social science, and the humanities.

The LibreTexts mission is to unite students, faculty and scholars in a cooperative effort to develop an easy-to-use online platform for the construction, customization, and dissemination of open educational resources (OER) to reduce the burdens of unreasonable textbook costs to our students and society.

Co-founded by open-education visionary Dr. David Wiley and education-technology strategist Kim Thanos, Lumen Learning is dedicated to facilitating broad, successful adoption of OER.

Online open textbooks organized by topic. Mainly science and engineering based, but also has some management and language texts.

OER Commons is a public digital library of open educational resources. Explore, create, and collaborate with educators around the world to improve curriculum.

The World Bank's collection of open access resources, primarily in international economics but also including selections from related topics.

A collection of open educational resources (OER) from University of Michigan. Access a range of course materials, videos, lectures, student work and more. Nearly all of the content here is openly licensed for reuse under Creative Commons (link is external).

A directory of openly published textbooks produced by members of Open Oregon

Hosted by Rice University. Contains a wide spectrum of topics including the sciences and social sciences.

Open textbook consortium hosted by the University of Minnesota. Other members include Virginia Tech, Ohio State University, and the University of Arizona.

This directory provides an index of 1712 books published across 78 Pressbooks networks. Search and filter books by keyword, subject matter, license, and more.

This is a collection of books and writings that exist in the public domain. Imported into Pressbooks and made accessible for more users, this is a fantastic resource for a variety of disciplines.

Digital, open access titles.

Openly Available Sources Integrated Search (OASIS) is a search tool that aims to make the discovery of open content easier. OASIS currently searches open content from 57 different sources and contains 159,459 records.

OASIS is being developed at SUNY Geneseo's Milne Library in consultation with Alexis Clifton, SUNY OER Services Executive Director.

The meta finder searches multiple OER repositories, open course ware sites, and government websites for open and public domain content.