Free: All time Similar to Khan Academy, Codecademy offers free courses online. It is an interactive platform that provides free coding classes in six different programming languages (Python, PHP, jQuery, JavaScript, Ruby, HTML and CSS). Besides the classes, Codecademy also...

Free: All time Khan Academy is a non-profit educational website that features thousands of educational resources, including a personalized learning dashboard, over 100,000 exercise problems, and over 4,000 micro lectures via video tutorials. The subjects covers anything from mathematics to...

Free: All time Similar to Project Gutenberg, LibriVox is an online digital library of free public domains books, but in audio format. Read entirely by volunteers, LibriVox by had a catalogue of over 6,244 unabridged books available to download by...

Free: All time In the spirit of saving money and living green, if you ever wish to finally read those masterpieces that you missed in school, head to Project Gutenberg. Project Gutenberg is a volunteer effort to digitize and distribute...