Synfig Studio - Just another WordPress site
PaintBerri - PaintBerri is a free art site that offers an awesome oekaki community.
Live2D Cubism - Live2D is the world's first drawing technology to enable 3D rendering of 2D images.
okekai - A small community site where you can draw, animate, and chat through pictures all for free
Creature - Creature 2D Skeletal and Mesh Animation Tool
Brush Ninja - Hand-drawn Animated Gif Creator