A Very Brief Introduction to Open Access
A factsheet by Peter Suber, the de facto leader of the OA movement
How Open Is It?
A collaborative document from the Public Library of Science (PLoS), the Scholarly Publishing and Academic Resources Coalition (SPARC®), and the Open Access Scholarly Publishers Association (OASPA).
The Open Access Directory
"A compendium of simple factual lists about open access (OA) to science and scholarship, maintained by the OA community at large."
Open Access Explained
A video by PhD Comics.
Paywall: The Business of Scholarship
This 2018 film "dives into the need for open access to research and science, questions the rationale behind the $25.2 billion a year that flows into for-profit academic publishers, examines the 35-40% profit margin associated with the top academic publisher Elsevier and looks at how that profit margin is often greater than some of the most profitable tech companies like Apple, Facebook and Google."
Open Access to Scholarly and Scientific Research Articles
A factsheet from SPARC®, an international alliance of academic and research libraries working to correct imbalances in the scholarly publishing system.
Policy Guidelines for the Development and Promotion of Open Access
"A reference point for all stakeholders to clarify basic doubts in the field of Open Access" from UNESCO, the United Nations Educational, Scientific and Cultural Organization.