SVG Backgrounds - Customize, scalable backgrounds and patterns for free
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
MagicPattern - The best design toolbox with 10+ tools for anyone
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Patternify - The CSS pattern generator
Webhook.site - Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.