Arcane University:CrazyBump for Skyrim
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CrazyBump is one of the many automated texturing tools, others are included into modern 3d software as modules. It can also be used to overhaul existing or algorythm-created textures. Usually it gives out dds or png files, however its best to do some post processing in Gimp or Photoshop to adjust the 5 channel PBR layers to the 2 or 3 channels being used in Skyrims texture sets.
You can find details of the export formate and necessary settings on the page Arcane_University:DDS_Data_Format.
