NVIDIA just released a new version of their free Texture Tools. Texture Tools is a handy tool for compressing textures, generating MIP, normal and cube maps and more. It also includes a Photoshop plugin and can be driven from a command line interface.
Details from the NVIDIA developer site:
Today, we’re releasing the free NVIDIA Texture Tools Exporter, the new version of our DDS texture compression tool, available both as a standalone application and as a plugin for Adobe Photoshop.
This all-new release adds support for modern, CUDA-accelerated Texture Tools 3.0 compression (including ASTC, BC7, and BC6s), support for more than 130 DXGI and ASTC formats, linear-space, slope-space, and pre-multiplied alpha mipmapping, command-line and Photoshop automation, and a unified user interface.
You need to be running a 64bit version of Windows 7,8 or 10 and texture tools requires an NVIDIA GPU. You can learn more about NVIDIA Texture Tools in this article or by watching the video below.