Texture Creator is a simple editor extension that allow you to easily create materials from a single picture without going out of unity.
Taking as input a single picture of any size, you will be able to create a seamless diffuse, normal, height, specular and occlusion maps, using simple controls. Texture creator will also create a material for you and assigns all the maps automatically, for an extra-fast worklow.
This tool is best suited for programmer art and quick prototyping. While it can produce great results for simple materials, experienced artists might find it limited.