Software used to generate normal map from an input image as well as other maps. Also provides options to tweak the result.
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Pro Many tweak controls
You can fine tune the result to achieve the desired look that you need.
Pro Generates more then just a normal map
While this tool can generate normal maps, you can also create maps such as Height, Ambient Occlusion, Specular, and more. You can also input your own maps instead for preview.
Pro 3d View
You can preview your normal map using the built-in 3d viewer and get an idea what you're getting.
Costs around $20.