Exported assets are free to use commercially and modify.

SubsurfaceScatteringShader.js

SubsurfaceScatteringShader

Translucent scattering

SubsurfaceScatteringShader
Preview requires WebGL2. You can still download the demo.
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Makes light spread beneath a surface, like light passing through skin, wax or a leaf. Look for warm color on the backlit side.

Official source