skribbl - Word guessing based on drawing.
Wren - Offset your carbon footprint by saving rainforests
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.
gartic.io - Draw, guess, and win!
Treepoints - Fight climate change and earn rewards