Spine - Spine is 2D animation software designed specifically for software and game development.
Pivot Animator - Pivot Stickfigure Animator is a unique software, that allows you to create stick figure animations...
Synfig Studio - Just another WordPress site
Stick Nodes - Stick Nodes is an app that allows you to easily create your own stickfigure-based animations
AnimeEffects - AnimeEffects is a 2D keyframe animation tool based on deformation of polygon meshes.
StickyPy - Stick figure animation program written in Python and PyGame