Blog posting with a categorized list of free books. Lots of useful comments as well.

Today businesshackers want to read some e-books... as usual everything must be either cheap or free, but high quality... check it out:

A collection of books, howtos and documentation on GNU/Linux for offline use

"This list of classic books is the result of a poll ACM conducted where members named their favorite computer science books.We plan to make the full text available online to members as we obtain permissions from authors to display each book. We hope you enjoy the books in this Classic Books series!"

"Here you'll find selected titles that we are pleased to be able to offer you completely free of charge!"

Highest quality business software books all of which are available for free download.

Highest quality CAD/CAM books all of which are available for free download.

Highest quality computer books all of which are available for free download.

Free Computer Art Business & Investing ebooks

This site contain lots of free online books related to medical and computer science .
All books are freee

Free books on technology subjects

This site was created as a service to those learning programming that might not have the resources available to purchase books.

Amazon Listmania

FreeBookZone lists free computer science, engineering books, programming manuals, lecture notes and coursewares, all of which are freely available over the internet. Most of the contents are not provided by us, but we do provide materials that are published under GNU General Public License.

Free Computer Books, Tutorials & Lecture Notes

Free Programming Resources is a directory of links to free programmer resources including free programming tutorials, free online programming books, free compilers, free programming tools, free source code, programming libraries, game programming resources, graphics resources and security tools.

Free computer science and engineering books (+ lecture notes)

Highest quality Java books all of which are available for free download.

Highest quality Linux books all of which are available for free download.

Index of O'Reilly open books.

Listing over 25,000 free books on the Web

Amazon Listmania

Prentice Hall PTR is proud to publish the Bruce Perens' Open Source Series with Bruce Perens, Series Editor. This Series focuses on Linux and Open Source technologies, including new and emerging technologies. It targets professional software developers, system and network administrators, and power users.

This is a collection of programming language theory texts and resources, all of which are freely available over the Internet.

Many valuable reference texts on programming language theory, previously only available in paper form, have in recent years become publicly accessible from the net. I list here the ones I know of; below that you will also find a much broader list of lecture notes and tutorials, other interesting reading, plus a collection of related resources.

Textbook Revolution is the web's source for free educational materials. This is a student-run, volunteer-operated website started in response to the textbook industry's constant drive to maximize profits instead of educational value.

A huge collection of Free Computer, Programming, Mathematics, Technical Books, Lecture Notes and Tutorials.