"A collection of texture tools generating normal maps, texture compression, mip map generation and cube map...

"A collection of texture tools generating normal maps, texture compression, mip map generation and cube map formatting packaged as a plugin for Adobe Photoshop 5.0, 5.1, 6.0, 7.0, CS, CS2, CS3, CS4, CS5 and CS6."
https://developer.nvidia.com/nvidia-texture-tools-adobe-photoshop