The Art of Unix

http://www.faqs.org/docs/artu/

Perl for Impatient Developer

http://blob.perl.org/books/impatient-perl/iperl.pdf

Game Development with Javascript

http://www.brighthub.com/hubfolio/matthew-casperson/blog/archive/2009/06/29/game-development-with-javascript-and-the-canvas-element.aspx

Introduction to x64 Assembly

http://software.intel.com/en-us/articles/introduction-to-x64-assembly/

Database Fundamental

https://www.ibm.com/developerworks/wikis/display/db2oncampus/FREE+ebook+-+Database+fundamentals