List of interesting/useful literature (avalable for free). Mostly English.

• The C programming Language
• Practical Common Lisp
• On Lisp
• Programming Ruby - The Pragmatic Programmer's Guide
• Python Tutorial
• Perl in a Nutshell
• Squeak by Example
• Advanced Bash-Scripting Guide

• Structure and Interpretation of Computer Programs
• Unix Programming FAQ
• Advanced Linux Programming

• LINUX Dokumentační projekt, 3. aktualizované vydání [CZ]
• The Linux Documentation Project Index

• Linux Device Drivers

• Single UNIX Specification
• C99 (ISO/IEC 9899:1999)
• Common Lisp HyperSpec

• Debian New Maintainers' Guide
• Securing Debian Manual

• Pro Git
• Version Control with Subversion

• Intel Software Developer's Manuals
• AMD64 Architecture Programmer's Manuals
• AMD64 Application Binary Interface

• TeXbook naruby [CZ]

• The Cathedral and the Bazaar
• The Art of Unix Programming
• The Art of Unix Usability

• The UNIX-HATERS Handbook

• Calculus Lecture Notes