Free Books to Learn Programming

JavaScript

• Eloquent JavaScript, 
• JavaScript Guide, 
• Speaking JavaScript,
• JS The Right Way,
• Oh My JS

HTML & CSS

• Mozilla, 
• Dive into HTML5, 
• 20 Things I Learned,
• HTML Dog,HTML & CSS,
• HTML5 for Designers, 
• DOM Enlightenment

jQuery

• jQuery Fundamentals,
• Learn jQuery

Python

• Python for You and Me, 
• Dive into Python, 
• Learn Python the Hard Way, 
• Think Python,
• Python for Fun, 
• Tango with Django, Django

Ruby & Ruby on Rails

• Why’s (Poignant) Guide to Ruby, 
• Learn Ruby the Hard Way, 
• Learn to Program, 
• Learn Rails by Example

PHP

• PHP Programming, 
• Practical PHP

Java

• Programming in Java, 
• Thinking in Java,
• O’Reilly Learning Java,
• Think Java, 
• Java & CS,
• Java for Python Devs

Node.js

• The Node Beginner Book,
• Mixu’s Node book, 
• Node Up and Running, 
• Mastering Node.js

SQL (Database)

• SQL Zoo, 
• SQL @Stanford, 
• Essentail SQL, 
• SQL for Nerds