BundlePhobia - Find the performance impact of adding a npm package to your bundle.
rubular - A ruby based regular expression editor
JavaScript.com - A free resource for learning and developing in JavaScript
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
aijs.rocks - A collection of AI-powered JavaScript apps
RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.