- bundlephobia: find the cost of adding a npm package to your bundle
- Snyk Advisor: compare Popularity, Maintenance, Security and Community of any pakage
- best of JS: find popular pakages for your needs
- material color tool: Create, share, and apply color palettes to your UI, as well as measure the accessibility level of any color combination.
- Material Design Guidelines: Create intuitive and beautiful products with Material Design
- CSS tricks: CSS-Tricks is really about building websites and all that entails, mostly from a front-end perspective.
- boxy SVG: An online SVG editor
- regex 101: Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java. Features a regex quiz & library.
- regexper: Great visualization tool for regex. Helps you understand complicated regex.
- regexer: RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
- jsconsole: JavaScript Playground
- jsfiddle: Playground
- codesandbox: Create, share, and get feedback with collaborative sandboxes for rapid web development.
- codepen: The best place to build, test, and discover front-end code.
- jsconsole: JavaScript Playground
- cyberchef: Encryption, encoding, hashing, XOR whatever it is, cyberchef does it.
- exploit DB: Find exploits for your products
- Can I Use: Browser support tables for modern web technologies
- UnicodeExplorer: UnicodeExplorer, search and copy unicodes, html entities, escape chars etc
- unicode-table: UnicodeExplorer, search and copy unicodes, html entities, escape chars etc
- ECHO JS: Discover whats new in JavaScript!
- HTTP status codes: reference database of HTTP Status Codes with their definitions and helpful code references all in one place.