The following books are available either for download or for reading online, free of charge.

Books about Linux

• Advanced Linux Programming by Mark Mitchell, Jeffrey Oldham, and Alex Samuel

• Comprehensive Linux Textbook by Muayyad Saleh Al-Sadi

• Java Application Development on Linux by Carl Albing and Michael Schwarz

• Linux Client Migration Cookbook, Version 2: A Practical Planning and Implementation Guide for Migrating to Desktop Linux by Chris Almond, et al

• Linux Compute Clusters by Chander Kant

• The Linux Cookbook: Tips and Techniques for Everyday Use by Michael Stutz

• Linux Device Drivers by Alessandro Rubini and Jonathan Corbet

• Linux From Scratch by Gerard Beekmans

• Linux Installation and Getting Started by Matt Welsh

• Linux Kernel Module Programming Guide by Ori Pomerantz

• Linux Network Administrator's Guide by Olaf Kirch and Terry Dawson

• Securing and Optimizing Linux by Gerhard Mourani

• Self-Service Linux: Mastering the Art of Problem Determination by Dan Behman and Mark Wilding

• Slackware Linux Essentials by Alan Hicks, Chris Lumens, David Cantrell, and Logan Johnson

Open Source and Free Software

• Free as in Freedom: Richard Stallman's Crusade for Free Software by Sam Williams

• Open Sources: Voices from the Open Source Revolution by Sam Ockman, Linus Torvalds, Eric S. Raymond, Richard Stallman, et al

• The Cathedral and the Bazaar by Eric S. Raymond

• Open Source Licensing by Lawrence Rosen

• Open Source Development with CVS by Karl Fogel and Moshe Bar

• Open Source Security Tools: Practical Applications for Security by Tony Howlett

• Producing Open Source Software by Karl Fogel

• Free for All by Peter Wayner

Related Books

• Motif Programming Manual By Antony Fountain, Jeremy Huxtable, Paula Ferguson & Dan Heller

• Perl 5 by Example by David Medinets

• Programming Ruby by David Thomas and Andrew Hunt

• The Art of Unix Programming by Eric S. Raymond

• Web Client Programming with Perl by Clinton Wong

• Z4CK by Kevin Milne