Nifty - Manage projects, work, and communications in one place.
skribbl - Word guessing based on drawing.
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
FreeBusy - Easiest way to share availability across calendars for free
gartic.io - Draw, guess, and win!