OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Duik - Comprehensive animation and rigging toolset for Adobe After Effects
Adobe Animate - Adobe Animate is a Flash, vector animation software.
Limber for After Effects - IK system for After Effects using shape layers as limbs for character animation
Pencil2D - Pencil2D is an opensource animation/drawing software for Mac OS X, Windows, and Linux, based on old...
Spine - Spine is 2D animation software designed specifically for software and game development.