Wick Editor - The Internet's free and open-source creation toolkit.
Synfig Studio - Just another WordPress site
AnimationMaker - Create animated presentations and export them to a video file, animated gif or HTML based on SVG...
Creature - Creature 2D Skeletal and Mesh Animation Tool
Adobe Animate - Adobe Animate is a Flash, vector animation software.
Live2D Cubism - Live2D is the world's first drawing technology to enable 3D rendering of 2D images.