It’s my current go-to for material creation and is good at creating a normal map from nothing. Substance Designer While this, again, isn’t free it is one of the better packages I’ve used for authoring textures.None of these solutions are as good as generating a normal from the difference between two meshes, but this one has a lot of control and does a good job. The best part of the software is the delighting it does for the base color map as well as the tiling features. Bitmap 2 Material (B2M) is not a free application, but is one of the better options I’ve used.I don’t think there has been any development on it for a long time, but it was pretty standard in the games industry for a while. Crazy Bump which is free, and has been around for a long time.I agree with and that creating from a photo is the quickest way to do it without baking the difference between two meshes.