Review of Insane Bump powered by the Slant community.
A small free and open source software developed for making different bump maps. Some of its code is now in the more recent software based of of this one, called Awesome Bump.
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Cons
Con You get what you pay for
No tutorials on the website. No intuitive way to export images. The program has to be opened in the same folder as the textures you want to use.