E-Books Directory Blog
Science e-books added daily
FreeScience.info
Free science books for everybody
Wikibooks
Free library of educational textbooks that anyone can edit
The Assayer
Catalog of books whose authors have made them available for free
The Online Books Page
Listing over 2 million free books on the Web
CheapestTextbooks
Price compares dozens of textbook selling and renting sites.
PlanetMath Books
Math for the people, by the people.
Ludwig von Mises Institute: Literature
Online offering of the literature of the Austrian School and libertarian ideas
IN-TECH
Books covering fields of Artificial Intelligence, Manufacturing, Robotics and Operations Research.
Free Books 4 Doctors
Promoting free access to medical books
BookBoon.com
Online textbooks for students in PDF format
Textbook Revolution
Dedicated to increasing the use of free educational materials by teachers and professors