Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
PaintBerri - PaintBerri is a free art site that offers an awesome oekaki community.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Brush Ninja - Hand-drawn Animated Gif Creator
GIMP - GIMP is a multiplatform photo manipulation tool.
okekai - A small community site where you can draw, animate, and chat through pictures all for free