NeoTextureEdit - NeoTextureEdit is an open source (GNU LGPL v.
Material Maker - Cross-platform, procedural texture generation tool.
GraphicDesignerToolbox - Graphics editor for composing textures, buttons, logos, icons.
Substance Designer - Substance Designer is a node-based non-destructive application for material authoring.
Patternshop - Patternshop is a tool to create textures for fabric design.
Filter Forge - On the surface, Filter Forge is just a Photoshop plugin, a pack of filters that generate textures...