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If you are a Blender user, this addon I created might be interesting for you:

NormalmapGenerator

This is a program to generate normal-, spec- and displacementmaps from image textures in one go. It supports stack processing and a few other nice features, but has some rough edges and is still in development.

Download

See the releases section. Usually there are Windows (32 bit) and Linux (64 bit) binaries available on each release.

Screenshot

Features

• Fully multithreaded with OpenMP, will use all available CPU cores
• Keep Large Detail (see below for details)
• Fast and easy way to create normal, spec and displacementmaps

Keep Large Detail

One of the things I hate about classic normalmap generators is how they handle large image textures: usually the normalmap is unusable due to fine detail and the whole information about "large detail" (the overall curvature) is lost.

This is a large texture generated the classic way:

When used in a rendering, it will look like this:

What the feature I called "Keep Large Detail" does is that it blends a downscaled version of the image over the original image, thus retaining the overall curvature information while still showing fine detail:

Rendered, it looks much better: