I was looking for a program that can convert texture maps (Diffuse) into other types of maps (Height, Normal, Specular, Ambient Occlusion). I found out that there is a Gimp plugin that is able to do that. I have tested it with Gimp 2.8.10 and it works for me.
Here is a link to download the "Insane Bump" plugin version 1.0.6. Insane Bump plugin
Here is a link to a video that shows how it works... Insane Bump Tutorial
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Here is a link to download the "Insane Bump" plugin version 1.0.6. Insane Bump plugin
Here is a link to a video that shows how it works... Insane Bump Tutorial
oort