Wren - Offset your carbon footprint by saving rainforests
skribbl - Word guessing based on drawing.
YAYZY - Track the carbon footprint of each purchase in real-time
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Klima - Go carbon neutral
gartic.io - Draw, guess, and win!