Ok. Found it, https://github.com/mrdoob/three.js/tree/master/editor https://github.com/mrdoob/three.js/tree/master/editor doesn't say, but https://github.com/mr

Ok. Found it, https://github.com/mrdoob/three.js/tree/master/editor https://github.com/mrdoob/three.js/tree/master/editor doesn't say, but https://github.com/mrdoob/three.js/ https://github.com/mrdoob/three.js/ says MIT