Khan Academy is a non-profit educational organization.

Udacity is a for-profit educational organization offering massive open online courses (MOOCs).

SoloLearn provides coding tutorials mainly through its mobile app.

Playir is a mobile app and game creation platform, that allows you to create your own games and apps from pre-made templates.

Anki is a spaced repetition flashcard software.

Star Walk is an interactive astronomy guide that shows celestial objects in the exact positions on the sky above.

zuknow is a social flashcard app.

Coursera works with universities and other organizations to offer online courses, specializations, and degrees in a variety of subjects, such as engineering, …

Everipedia is the next generation online encyclopedia.

AnkiApp is a flashcard app for iOS (iPhone + iPad), MacOS, and Android.

Storyboard That is a free online storyboard creator.

NinChanese is a story-based, interactive language application that teaches you to speak, read, write, and understand Chinese.

VocApp.com is a vocabulary improvement software platform.

Babbel is a subscription-based language learning app and e-learning platform.