Languages
C

* The C book
* The new C standard - an annotated reference

C++

* Thinking in C++
* C++ Annotations
* How to Think Like a Computer Scientist
* Software optimization resources by Agner Fog

C#

* .NET Book Zero: What the C or C++ Programmer Needs to Know About C# and the .NET Framework
* Data Structures and Algorithms with Object-Oriented Design Patterns in C#
* Threading in C#

Common Lisp

* Practical Common Lisp
* On Lisp

Haskell

* Real world Haskell
* Learn You a Haskell for Great Good!

Java

* Thinking in Java
* How to Think Like a Computer Scientist
* Java Thin-Client Programming

JavaScript

* Eloquent JavaScript

Lua

* Programming In Lua (for v5 but still largely relevant)

NoSQL

* CouchDB: The Definitive Guide

Objective-C

* The Objective-C Programming Language

Perl
Perl 5

* Beginning Perl
* Extreme Perl (license not specified - home page is saying "freely available")
* Embedding Perl in HTML with Mason (Open Publication License)
* Practical mod_perl (CreativeCommons Attribution Share-Alike License)
* Higher-Order Perl
* Learning Perl the Hard Way
* Perl & LWP
* Perl for the Web
* Web Client Programming with Perl
* Modern Perl 5 (Work in progress)

Perl 6

* Perl 6 (Work in progress)

PHP

* Practical PHP Programming
* Zend Framework: Survive the Deep End

Prolog

* Building Expert Systems in Prolog
* Adventure in Prolog
* Prolog Programming A First Course
* Logic, Programming and Prolog (2ed)
* Introduction to Prolog for Mathematicians
* Learn Prolog Now!
* Natural Language Processing Techniques in Prolog

Python

* Dive Into Python
* Dive Into Python 3
* How to Think Like a Computer Scientist
* A Byte of Python
* Python for Fun
* Invent Your Own Computer Games With Python
* Thinking in Python

Ruby

* Why's (Poignant) Guide to Ruby
* Programming Ruby - The Pragmatic Programmer's Guide
* Mr. Neighborly's Humble Little Ruby Book
* Ruby Best Practices
* MacRuby: The Definitive Guide

Scheme

* The Scheme Programming Language (Edition 4)

Shell

* Advanced Bash-Scripting Guide (An in-depth exploration of the art of shell scripting)
* Mastering PowerShell

SQL

* Practical PostgreSQL

x86 assembly

* Paul Carter's tutorial
* Software optimization resources by Agner Fog

Algorithms and Data Structures

* Algorithms
* Data Structures and Algorithms with Object-Oriented Design Patterns in Java
* Planning Algorithms

Frameworks/Projects

* The Django Book
* The Pylons Book
* Introduction to Design Patterns in C++ with Qt 4 (Open Publication License)
* Ruby on Rails Tutorial: Learn Rails By Example
* The Definitive Guide to symfony

Text Editors and IDE's

* A Byte of Vim

Version control

* The SVN Book
* Mercurial: The Definitive Guide
* Pro Git

Release Tools

* Maven by Example
* Maven: The Definitive Guide

Unix / Linux

* The Art of Unix Programming
* Linux Device Drivers, Third Edition
* Advanced Linux Programming

Others

* Structure and Interpretation of Computer Programs (Creative Commons Attribution-Noncommercial 3.0 Unported License.)
* The Little Book of Semaphores
* Mathematical Logic - an Introduction
* An Introduction to the Theory of Computation
* Developers Developers Developers Developers
* Linkers and loaders
* Beej's Guide to Network Programming
* Domain Driven Design Quickly - based on Eric Evans's book.
* Let's Build a Compiler, by Jack Crenshaw
* Producing Open Source Software
* How to Write Parallel Programs
* Don't Just Roll the Dice (A usefully short guide to software pricing)


I hope you will enyoj in this share and find it usefull!
refference link

Thanks a lot for this link, they will help a lot!

Yeah very good Legis, i like your collection, especially algorithms and data structures !

Woah! Nice collection. You usually don't see to many e-books on Prolog or Powershell. Today, I think i'll get to uploading some of my massive E-book archive. And i think i may give perl a go. Not to learn it, just because it has replaced alot of shell scripting on *nix systems