Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
Free Summarizer - Summarize *any* text online in just a few secs. *MAGIC*
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
SMMRY - Summarize articles, text, websites, essays and documents for free with SMMRY.
Brainscape - Find, create, and study SMART FLASHCARDS on any device. DOUBLE your learning speed using the most effective study system on the planet. Keep all your content in sync across Brainscape's website and your Android devices.
TLDR This - Automatically summarize any article or webpage in a click.