Pattern Monster - Pattern Monster is a pattern maker app to create vector patterns for your projects
Material Maker - Cross-platform, procedural texture generation tool.
PatternPad - Create beautiful geometric patterns
TextureLab - Free, Cross-Platform, GPU-Accelerated Procedural Texture Generator.
SVG Stripe Generator - SVG Stripe Generator is an easy-to-use tool that enables you to create unlimited stripes and then download them to the device.
Rectitude - Procedural generation pixel art editor.