Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Synfig Studio - Just another WordPress site
Sketch - Professional digital design for Mac.
Live2D Cubism - Live2D is the world's first drawing technology to enable 3D rendering of 2D images.
Invision - Prototyping and collaboration for design teams
Creature - Creature 2D Skeletal and Mesh Animation Tool