This free plugin makes it easy to create complex noise generation shaders with the help of a visual graph editor! Useful both in the editor and at run-time.
Example uses:
1) Quickly generate and iterate a heightmap for terrain objects.
2) Generate textures for 3D surfaces or post-process effects.
3) Quickly preview/iterate on noise textures at run-time before baking them into a texture file.
This is an open source project, available at:
http://www.github.com/heyx3/GPUNoiseForUnity