Patterninja - Create patterns online
Cool Backgrounds - Create fast, one-of-a-kind hero images for blogs & websites
Doodad.dev's Pattern Generator - A free tool for creating unique, royalty-free, repeatable patterns.
Hero Patterns - A collection of repeatable SVG background patterns
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.
PatternPad - Create beautiful geometric patterns