Exported assets are free to use commercially and modify.

ToonShader.js

ToonShader1

Cartoon shading

ToonShader1
Preview requires WebGL2. You can still download the demo.
Drag to orbit · Middle-drag to pan · Scroll to zoomOne finger to orbit · Two fingers to pan or zoom

Uses simplified shading and highlights for a cartoon look. Turn the model to see how different sides catch the light.

Official source