Patterninja - Create patterns online
Patternify - The CSS pattern generator
Pattern Monster - Pattern Monster is a pattern maker app to create vector patterns for your projects
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.
Patternizer - Create awesome background patterns in just a few minutes
Adobe Capture - Turn any photo into a color theme, Look, vector graphic, or unique brush that you can use in your creative projects with Adobe Capture.