Laigter - Normal map generator for 2d sprites.
Material Maker - Cross-platform, procedural texture generation tool.
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Filter Forge - On the surface, Filter Forge is just a Photoshop plugin, a pack of filters that generate textures...
Substance Designer - Substance Designer is a node-based non-destructive application for material authoring.
TextureLab - Free, Cross-Platform, GPU-Accelerated Procedural Texture Generator.