Fandom - The entertainment site where fans come first.

GoConqr - Social learning platform for educators & learners

Wikiful - Wikiful is an online platform that makes it easy to build and share a wiki.

Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.

Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...

Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.