Substance Designer is a powerful cross-platform application that provides various tools for working with game or animation / VFX textures.
You will be able to work in a non-linear environment and to batch process meshes and textures, use a powerful image editor that is backed up by a smart paint system, and utilize versatile preset filters.
Allegorithmic Substance Designer is cross-platform and it works on Mac OS X and Windows. Binaries for the Windows platform are available on the project’s homepage.