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C#

30 days to learn C#
A YouTube series of 30 tutorial videos introducing C#.
Getting Started with Visual C#
From Microsoft.

JavaScript and jQuery

JavaScript - Code School
A free orientation course to learn the building blocks of jQuery.
JavaScript Tutorial from W3 schools
JavaScript tutorial.
JavaScript | Codecademy
Step by step course to learn JavaScript.

Objective-C

Cocoa Dev Central: Learn Objective-C
A step by step tutorial for learning Objective-C.
Programming with Objective-C: About Objective-C
From the Apple developer page.

PHP

PHP Tutorial from W3 Schools
Teaches many functions of PHP programming.
PHP Getting Started Manual
A tutorial from php.net.
PHP | Codecademy
Step by step course in PHP.

Ruby on Rails

Ruby on Rails - Code School
Two free orientation courses to learn the basic building blocks for Ruby on Rails.
Ruby on Rails Guides
Getting started with Ruby on Rails from rubyonrails.org.
Ruby | Codecademy
Step by step course through Ruby on Rails.

SQL

SQL Tutorial from W3 schools
Tutorial in SQL.
SQL ZOO
Tutorials on SQL programming.
SQL Tutorial - SQL Query Reference and Programming Examples
Information on SQL commands, table manipulation, string functions, data functions, and more.