DeviantArt - deviantART was created to entertain, inspire, and empower the artist in all of us.

DrawPile - Drawpile is a drawing program that lets you share the canvas with other users in real time.

Brush Ninja - Hand-drawn Animated Gif Creator

QueekyPaint - QueekyPaint is a unique browser-based drawing tool for creating animated drawings online.

pixiv - pixiv is an illustration community service where you can post and enjoy creative work. A large variety of work is uploaded, and user-organized contests are frequently held as well.

Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.