Blender (via https://github.com/ndee85/coa_tools https://github.com/ndee85/coa_tools) and Godot's Skeleton2D node are both open-source. I'd assume Spine's advan

Blender (via https://github.com/ndee85/coa_tools https://github.com/ndee85/coa_tools) and Godot's Skeleton2D node are both open-source. I'd assume Spine's advanced features far outpace them, but I also suspect the need for such features is rare.