Libraries & online universities

• Internet Public Library
• Librarians' index to the internet
• Free PDF books
• Feedbooks (free ebooks)
• Learn Out Loud (free audio books)
• Books Should Be Free (free audio books)
• LibriVox.org (public domain audio books)
• Digitalbook.io (free ebooks and audio books)
• Librophile (ebooks and audio books)
• Scribl (free electronic and audio books)
• Global Grey Ebooks (public domain ebooks)
• Free Classic Audio Books
• Free Google ebooks
• Kindle Popular Classics (free classic ebooks)
• Kindle Limited-Time Offers
• Free books for your Kindle
• Free Book Sifter (lists free Kindle books)
• Hundred Zeros (Kindle books)
• Wikibooks
• Read Print (free online books library)
• eBooks Read (free ebooks)
• Many Books (free ebooks)
• 2020ok (free ebooks)
• Faded Page (free ebooks)
• Open Culture's free ebooks
• Standard eBooks.org (free classic ebooks)
• The Online Books Page (free classic books)
• Ebookee
• 4shared (ebook search engine)
• Document Search (pdf search engine)
• Internet Archive
• Open Library
• Free education
• Project Gutenberg
• Digi Libaries
• Virginia Tech's Digital Library and Archives (free rare old books in pdf form)
• The Literature Network (read books online)
• The Electronic Literature Foundation
• DailyLit (read books by email or RSS)
• World Public Library
• Library Spot
• MIT's OpenCourseWare
• UCI's OpenCourseWare
• Udacity (Stanford University' free video online course, free regist. required)
• OpenCourseWare Finder
• Morningstar's Investing Classroom
• Small Business Assocation's Online Courses
• Academic Earth.org (free online cources from different universities)
• Khan Academy.org (free online video courses)
• Hillsdale's Constitution 101 video course (free registration required)
• Mr University (free online econonomics video courses)
• Codecademy (learn how to code)
• FSI Language Courses
• Coursera.org (free registration required)
• edX.org (free registration required)
• Tools for verifying and assessing the validity of social media and user-generated content
• SFF World (Science Fiction and Fantasy World)
• Hard SF.org
• Scifipedia
• Baen Free Library (free sci-fi ebooks)
• Comic Books Archive
• Mystery Net
• What Should I Read Next
• Bookish must reads
• Free Ebooks: These Five Freedom Philosophers Will Liberate Your Mind
• What Every 20-Year Old Should Know about Liberty (free ebooks)
• Small Demons (free registration. The people, places and things from books,  and everywhere they can take you.)
• Current list of non-fiction books I've read