DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. All DOAB services are free of charge and all data is freely available. 

DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals. All DOAJ services are free of charge including being indexed. All data is freely available. 

Frontiers is a leading Open Access Publisher and Open Science Platform. The journals are led and peer-reviewed by editorial boards of over 100,000 top researchers. Covers more than 600 academic disciplines, one of the largest and highest-cited publishers in the world. 

Brill’s publications focus on the Humanities and Social Sciences, International Law and selected areas in the Sciences.

OATD is a resource for finding open access graduate theses and dissertations published around the world. 

Springer Open journals and books are made freely and permanently available online immediately upon publication. They are subject to high-level peer review, author and production services ensuring quality and reliability of the work. 

GALILEO Open Learning Materials brings together open educational resources throughout the University System of Georgia, including open textbooks and ancillary materials. 

CCCOER is a growing consortium of community and technical colleges committed to expanding access to education and increasing student success through adoption of open educational policy, practices, and resources. 

Open textbooks are textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. 

A collection of high quality, free-to-use courses that you can download and use for teaching. All content is stored in Google docs making it easy to access browse and download. 

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

MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity. 

Open Education Global is a member-based, global, non-profit supporting the development and use of open education around the world. 

The World Digital Library provides free access to manuscripts, rare books, maps, photographs, and other important cultural documents from all countries.  

Lumen provides affordable course materials designed to strengthen learning using open educational resources (OER).

OpenStax publishes high-quality, peer-reviewed, openly licensed textbooks that are absolutely free online and low cost in print.