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

Draw.Chat - Anonymous real-time whiteboard with text and video chat.

Brush Ninja - Hand-drawn Animated Gif Creator

Limnu - Sketch, share and collaborate with your team

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.

Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.