Mason OER Metafinder - The Mason OER Metafinder runs a simultaneous real-time federated search across 22 different OER sources.
OASIS - 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 117 different sources and contains 388,707 records.
Openstax College - Initiated by Rice University, their free textbooks are developed and peer-reviewed to ensure they meet college courses' scope and sequence requirements.
Open Textbook Library - Created by the University of Minnesota to support the development of high-quality open textbooks in various subjects.
CC Search - CC Search is a tool that allows openly licensed and public domain works to be discovered and used by everyone.
There are numerous OER textbook platforms available; some of the more well-known ones are:
BC Campus OpenEd - Provision of openly licensed textbooks and other OER materials with a broad discipline focus, including; business, education, science and mathematics
EdTech Books - Provision of openly licensed textbooks and other OER materials focusing on education as a discipline.
Lumen Learning - Lumen provides open courses in a variety of high-demand subjects and disciplines. These courses are collections of high-quality OER and may not necessarily be textbooks.
Merlot - A curated collection of free and open online teaching and learning services.
OER Commons - Provides college-level open textbooks from higher education institutions around the world.
Teaching Commons - The Teaching Commons showcases high-quality open educational resources from leading colleges and universities and makes them available to educators and students around the world.