American Economic Association
Open access to all journal content through August 2020. 

Annual Reviews
Beginning Monday, March 16th, they will temporarily remove access control to content. ​

EDP Sciences
To support all researchers during the Covid-19 pandemic, EDP Sciences has opened the journals content on their site from 2018-2020 so it is freely available for all to read.

Faculty Select (EBSCO)
Faculty can search12,400+ Open Educational Resources, get links for their Learning Management System (LMS) or distribution to students

GeoScience World 
26000+ chapters in 1600+ Earth Sciences books from nine publishers

Institute of Classical Studies
The Institute of Classical Studies has complied a list of open access resources related to ancient languages, classical texts, ancient history, art and archeology and more. This list is updated as more relevant information becomes available. 

Ohio State Univesity Monographs
Access to 699 OSU Press Books

The Royal Society
Providing some temporarily free journals

VitalSource
Create an account and get access to Bookshelf via VitalSource which is offering an expansive catalog of eTexts. 

BioMed Central 
Part of Springer/Nature, BMC publishes some open access journals in science and medicine

Digital Public Library of America (DPLA)
All of the materials found through DPLA--photographs, books, maps, news footage, oral histories, personal letters, museum objects, artwork, government documents, and so much more--are free and immediately available in digital format.

DOAB (Directory of Open Access Books)
Provides open access to over 854 academic peer-reviewed books from 25 publishers

DOAJ (Directory of Open Access Journals)
A collection of peer-reviewed open access e-journals

Google Books
Search a comprehensive index of full-text books

Hathi Trust Digital Library 
A repository providing access to public domain and in-copyright content from a variety of sources, including Google, the Internet Archive, Microsoft, and in-house partner institution initiatives. 

Humanities Digital Library--University of London Press
Collection of Open Access Journals published by the University of London Press at the School of Advanced Study.

Internet Archive
Offers over 20,000,000 freely downloadable books and texts. Also a collection of 1.3 million modern ebooks that may be borrowed by anyone with a free archive.org account. 

JSTOR Open Access Books
More than 6,000 open access ebooks from 75+ publishers, including Brill, Cornell University Press, De Gruyter, and University of California Press.

NCBI Bookshelf
Free online access to ebooks and documents in life sciences and healthcare

Open Access on Project Muse
Open access books and journals from several distinguished university presses and scholarly societies. 

OpenStax
OpenStax is a nonprofit educational initiative based at Rice University, and it's their mission to give every student the tools they need to be successful in the classroom. 

Paris Art Museum
Paris Musées, a collection of 14 museums in Paris have recently made high-res digital copies of 100,000 artworks freely available to the public on their collections website. Artists include Rembrandt, Monet, Picasso, Cézanne, and thousands of others. 

PLOS (Public Library of Science)
Open access ejournals in science and medicine

Project Gutenberg
Over 60,000 free ebooks. You will find the world's great literature here, with focus on older works for which U.S. copyright has expired.

Project Muse Open Access Books and Journals
Open access books and journals from several distinguished university presses and scholarly societies. 

Sage Open Access Journals 
Contains open access journals published by Sage. 

Standard Ebooks
Collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks.