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Airsketch - Simple screenshots + annotations for Mac 🖥️
skribbl - Word guessing based on drawing.
FakeClients Feedback - 🖌 A simple, free to use platform for design feedback
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Slack E-mail Add-ins - Quickly forward emails and attachments to Slack
gartic.io - Draw, guess, and win!