Flubaroo - Auto-graded tests + analytics in Google Sheets by a Googler

WordCounter.net - Count words, sentences, paragraphs etc.

Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.

TryDiff - Free online text comparison tool. Compare two texts side-by-side with character-level highlighting. Find differences instantly. 100% private.

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

Diff Checker - Diff Checker is a free online diff tool that quickly and easily gives you the text differences...