PubMed Central
full text scientific/health research
Open content on JSTOR
open access and free academic content/research on JSTOR
Planet eBook
public domain books, limited selection but well formatted
Page By Page Books
public domain books and texts
Project Gutenberg
free public domain ebooks
LibriVox
audio books and recordings of public domain books and texts
Tubi
streaming with ads, based in U.S.
Standard Ebooks
public domain ebooks, formatted into readable files
AfroLandTV
streaming with ads, focused on black movies/TV