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http://flatworldknowledge.com/ has an interesting model. You can read the book online for free, and you pay extra for the dead-tree version and extra student material. Their books are CC/BY/NC/SA, and they have, as their site puts it, "an easy-to-use editing platform called MIYO (Make It Your Own)" to customize a book. Full disclosure: I'm using one of their books in a course that I teach.

Anon because I've already moderated several times in this story thread.

MIT OpenCourseWare (That's their silly capitalization, don't blame me.)

Wired story about Flat World Knowledge, a company that provides free online and cheap printed copies of college texts that sells study aids and practice quizzes to support the business. Online browsing is free, PDF is about $20, and printed books cost about $60 or less if the pricing I read about is still current.

Wikibooks has books of several levels.

Here's a list of open books for undergraduate mathematics as recommended by Robert Beezer at University of Puget Sound

US House Bill 4575 is an attempt to authorize government grants to publishers of open-source college texts, as widespread affordable education is seen as good thing for the country as a whole. There's also a Senate version.

There's a consortium for Open Educational Resources among community colleges. They have lists of many titles under many categories. There's still a lot of work to be done, but some of the books have been peer-reviewed and they clearly mark which ones those are.

LibrarianChick links to all sorts of books and all sorts of sites that links to all sorts of other books. Some of these are texts, but there's also reference, fiction, tutorials, and more. Several of the linked works are university-level. There are also links to non-books, like search engines, research results pages at places like Harvard, and open online encyclopedias other than Wikipedia.

Textbooks Free is a fairly ugly site with beautiful content: links to textbooks by subject, links to other open textbook projects, and even an Amazon affiliate link so when you buy what non-open books you want you can support open textbooks. They also have links to open course materials like audio and video lectures. Their links include material from MIT, Johns Hopkins, University of California at Irvine, Tufts, Stanford, UC Berkeley and Carnegie Mellon.

Bookboon has ad-supported free textbooks. For those of you who won't get too distracted from studies by the ads, I think that's not a bad model. These are free but not open and you have to give them your email address to download the books.

Free Book Centre has links to lots of open and public domain texts. They are mostly CS, engineering, and mathematics but they have some medical books too. There are some books linked that are free-but-closed, and some of those are only free for non-commercial use or only in electronic format (sometimes only by browsing the book on the author's web site without even saving a local copy). Some of the links are currently broken, too. Overall, it's a pretty useful site if you're looking for CS/math/EE/medical materials. One additional note of caution: at least one "book" is just a detailed ToC for a book by someone else, some "books" are just sample chapters for closed books for sale, a few are lecture notes for specific courses collected but not necessarily edited into textbook form, and there are a handful that seem to be pirated copies of commercial books from the likes of O'Reilly. You have been warned.

Creative Commons has a tag for news items about open textbooks to help us k

Quick answer:

Introduction to Information & Communication Technology - Using Free Software and Open Technologies
Edited By: Will Brady
http://openbookproject.net/courses/intro2ict/index.xhtml

The Non-nerds Guide to Computers
http://en.wikibooks.org/wiki/Non-nerds_Guide_to_Computers

But seriously spend half an hour going through results of Google search on these terms: open textbooks computing

You will have to go through the texts yourself but there are many out there at many different levels.

Here are the main resources.

Wikibooks
http://en.wikibooks.org/wiki/Subject:Computing
http://en.wikibooks.org/wiki/Non-nerds_Guide_to_Computers
http://en.wikibooks.org/wiki/Computers_for_Beginners

Flat World Knowledge
http://www.flatworldknowledge.com/

MIT Open Courseware
http://en.wikipedia.org/wiki/MIT_OpenCourseWare
http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/index.htm

Make Textbooks Affordable open textbooks
http://www.maketextbooksaffordable.org/statement.asp?id2=37833

Student PIRGs
http://www.studentpirgs.org/open-textbooks-catalog#computersci

List at Walla Walla Community College
http://www.wwcc.edu/CMS/index.php?id=2835

The Assayer free books list
http://theassayer.org/
http://www.theassayer.org/cgi-bin/asbrowsesubject.cgi?class=Q#freeclassQAc

California Learning Resource Network (only math and science)
http://clrn.org/FDTI/index.cfm

OER Consortium
http://oerconsortium.org/discipline-specific/#Computer

Open Book Project
http://openbookproject.net/
http://www.openbookproject.net/courses/

Introduction to Information & Communication Technology - Using Free Software and Open Technologies
Edited By: Will Brady
http://openbookproject.net/courses/intro2ict/index.xhtml

O'Reilly Open Books
http://oreilly.com/openbook/

Textbook Revolution
http://www.textbookrevolution.org/index.php/Book:Lists/Subjects/Computer_Science

http://www.opentextbook.org/
http://freelearning.bccampus.ca/openTextbook.php?page_id=221&bookmark=Computing

First, there's Wikibooks http://en.wikibooks.org/wiki/Main_Page which includes a large number of references, but the quality isn't always superb.

Then, there's Flat World http://www.flatworldknowledge.com/ (A relatively new, growing site) that contains not as numerous titles as Wikibooks, but the writing is thorough and usually better than the textbooks themselves. The big downside to Flat World is that in your case (since it's still developing), it doesn't contain a computer science section, but it's being worked on and is expected to be released soon.

Though I have not personally used Wikibooks and Flat World extensively, I've heard from others that they're amazing resources.

I didn't create FWK, We just adopted one of their books - Intro to Macroeconomics. It's excellent! and, it's FREE. Check it out http://www.flatworldknowledge.com/printed-book/1628

• The Assayer
• Open Text Book
• Ink Textbooks
• Free Curricula Center
• Free Textbook Project
• Flat World Knowledge
• Textbook Revolution
• Wikibooks