Patterninja - Create patterns online
Material Maker - Cross-platform, procedural texture generation tool.
Pattern Monster - Pattern Monster is a pattern maker app to create vector patterns for your projects
TextureLab - Free, Cross-Platform, GPU-Accelerated Procedural Texture Generator.
Patternizer - Create awesome background patterns in just a few minutes
Filter Forge - On the surface, Filter Forge is just a Photoshop plugin, a pack of filters that generate textures...