Below are some of the links for Free Interactive Programming Tutorials available across the web.

Bash

C Sharp

C++

Clojure

CoffeeScript

Erlang

F Sharp

Git

Go

Haskell

HTML / CSS

Java

JavaScript

Language Agnostic

Lisp

MATLAB

Node

NoSQL

Objective-C

Ocaml

PHP

Python

R

Ruby

Scala

SQL

Vim