Synfig Studio - Just another WordPress site
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Animation Paper - Animation Paper is a software package for doing 2D animation.
DigiCel FlipBook - Whether you do 2D, 3D or stop motion Animation, DigiCel FlipBook makes animation easier!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
CelAction 2D - CelAction 2D is the name of a powerful and highly advanced 2D animation program for the perfect creation of 2D animation.