Hero Patterns - A collection of repeatable SVG background patterns
Patterninja - Create patterns online
SVG Backgrounds - Customize, scalable backgrounds and patterns for free
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.
Pattern.css - CSS library to fill empty background with beautiful patterns
SVGeez - SVGeez is a platform that offers many CSS SVG backgrounds and lets you customize and download them for free.