Description: jsFiddle is an online code editor that allows users to create, edit, debug and share HTML, CSS and JavaScript code snippets. It's useful for testing code, sharing examples, and prototyping web apps quickly.
Type: software
Pricing: Free
Description: WebPageTest is an open-source website performance testing tool. It allows users to test website load speeds from different locations around the world and provides performance metrics like First Contentful Paint, Speed Index, and Time to Interactive.
Type: software
Pricing: Open Source