New books and classic out-of-print titles openly accessible to teachers, students, scholars, and interested readers around the world

Contains a diverse collection of titles spanning a myriad of genres. Readers will find: the classics they know and love, from Austen to Twain, updated for EPUB 3.0 format with beautiful covers; the best Creative-Commons licensed works from innovative authors like Cory Doctorow; freely available textbooks and academic titles representing the push for open scholarship; and an exciting multicultural children’s collection.

Open access to 1,527,560 e-prints in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.

Brings together free, full-text scholarly articles from hundreds of universities and colleges worldwide. Curated by university librarians and their supporting institutions, the Network includes a growing collection of peer-reviewed journal articles, book chapters, dissertations, working papers, conference proceedings, and other original scholarly work.

Modeled after the Public Library of Science this is a platform for open access humanities scholarship.

PLoS is a nonprofit organization of scientists and physicians committed to making the world's scientific and medical literature a freely available public resource. It contains seven online peer-reviewed scientific and medical journals.

After this browser extension is downloaded, click the green tab and skip the paywall on millions of peer-reviewed journal articles. It's fast, free, and legal.