Spine - Spine is 2D animation software designed specifically for software and game development.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Synfig Studio - Just another WordPress site
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
DragonBones - DragonBones is an open source project for 2D skeletal animation.
VMagicMirror - VMagicMirror is application for VRM avatar on Windows desktop, to move your avatar without any special devices.