Live2D Cubism - Live2D is the world's first drawing technology to enable 3D rendering of 2D images.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.
Animaze by FaceRig - Livestream or Video Chat with custom 2d & 3d animated avatars. Add backgrounds & props with the Animaze editor. Use on Twitch, Discord, Skype, Zoom, & more
ZBrush - ZBrush is a digital sculpting and painting software solution.
VMagicMirror - VMagicMirror is application for VRM avatar on Windows desktop, to move your avatar without any special devices.