Patterninja - Create patterns online
Cool Backgrounds - Create fast, one-of-a-kind hero images for blogs & websites
Pattern Monster - Pattern Monster is a pattern maker app to create vector patterns for your projects
Patternizer - Create awesome background patterns in just a few minutes
Hero Patterns - A collection of repeatable SVG background patterns
Doodad.dev's Pattern Generator - A free tool for creating unique, royalty-free, repeatable patterns.