Synfig Studio - Just another WordPress site
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Creature - Creature 2D Skeletal and Mesh Animation Tool
Sketch - Professional digital design for Mac.
Live2D Cubism - Live2D is the world's first drawing technology to enable 3D rendering of 2D images.
Affinity Designer - Professional creative software, exclusively for Mac.