Today NVIDIA have announced a new release of their free Texture Tools. Used to compress textures in a multitude of different formats, generate normal, cube and mip maps and more, all while GPU accelerated... and completely free. It can be driven from the command line or using a Photoshop plugin.
Link:
https://www.gamefromscratch.com/post/2020/03/23/NVIDIA-Texture-Tools.aspx
