Spine - Spine is 2D animation software designed specifically for software and game development.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Synfig Studio - Just another WordPress site
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
AnimeEffects - AnimeEffects is a 2D keyframe animation tool based on deformation of polygon meshes.
ZBrush - ZBrush is a digital sculpting and painting software solution.