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Color Oracle is a free color blindness simulator for Windows, Mac and Linux that applies a full screen color filter to show what people with common color vision impairments see. The software is open source and version 1.3 was released in 2018.
Colour Contrast Checker is a web tool that checks the contrast between different colour combinations against WCAG standards. It displays pass results for normal and large text and provides background and foreground colour values with copy options.
Composer is a developer resource for coding, documentation, communities, security research, or software tools.
Converter is a utility that converts curl commands into code for languages and libraries such as Python, JavaScript and more. Conversion happens entirely in the browser, and the site states it does not transmit or record entered curl commands.
CSS Bed is a collection of classless CSS themes intended as starting points in web development. The site presents themes by name and notes that classless themes are responsive, have good browser support, are small, and require no learning curve for HTML users.
CSS Reference is a developer resource for coding, documentation, communities, security research, or software tools.
CSS3 Transform is a developer resource for coding, documentation, communities, security research, or software tools.
Daft Page is a developer resource for coding, documentation, communities, security research, or software tools.
Directory Lister is a PHP web directory lister. Its documentation covers changes, features, file search and file hashes. The release notes mention fixes to compressed ZIP downloads, configuration examples and hidden file handling, plus security fixes for path checks and direct-linked content.
Eleventy is a developer resource for coding, documentation, communities, security research, or software tools.
Front-End Checklist provides front-end quality rules for humans and AI agents. It offers over 350 rules across 11 categories, including accessibility, CSS, HTML, performance, security, privacy, and SEO. Curated checklists cover launch, SEO audit, performance, and accessibility reviews. The rules can also be connected to AI tools through an MCP server. Team features are listed as coming soon.
A free SVG wave generator for web design. Users choose a curve, adjust complexity, and randomize the result. The site notes it is now part of Haikei.app, and a Figma plugin is available for making waves directly in Figma.
Snazzy Maps is a repository of color schemes for Google Maps aimed at web designers and developers. Styles are used by copying the JSON from a style page and passing it to the map options of a Google Maps object. The site lists popular and recent styles and offers a Map Builder.
gradienta is a developer resource for coding, documentation, communities, security research, or software tools.
An online interactive HTML cheat sheet page containing code examples, web developer tools and markup generators. It includes panels for color, character and tag references, structures and attributes, plus generators for iframe, table, link, image and list markup, and a live-preview HTML editor. The pages are described as a quick guide for those already familiar with the languages.
HTML Comment Box is a website comments solution offered as a widget that can be pasted directly into a website's HTML. The script lets web designers and developers add a comment box to a web page to receive comments from visitors, which are currently accepted anonymously. A free plan and paid plans are listed.
HTML Reference is a free guide to HTML elements and attributes. The site organizes elements into collections including base elements, forms, lists, semantic elements and tables, and marks some entries as experimental. Each element entry lists attributes with meta, self-closing, inline and block annotations.
IP Lookup at ifconfig.me displays the visitor's IP address along with connection details such as user agent, language, referer, method, encoding, MIME type, charset and X-Forwarded-For. It also offers a command line interface for retrieving this information via curl.
Jekyll is a static site generator that takes text written in a markup language and uses layouts to create a static website. It also builds blog-aware static sites from Markdown, Liquid, HTML and CSS, and supports free hosting with GitHub Pages.
LightTest is a developer resource for coding, documentation, communities, security research, or software tools.
MakeTintAndShade is a developer resource for coding, documentation, communities, security research, or software tools.
Markdown to HTML is a free online converter for turning Markdown text into HTML in one step. Users paste or type Markdown and see it rendered as HTML, then download or copy the resulting HTML.
Modern CSS Solutions is a series by frontend developer Stephanie Eckles examining modern CSS approaches to common frontend problems. Articles cover topics such as custom properties, container query units, CSS math functions, selectors, accessibility upgrades, and testing browser feature support with fallbacks and build tools. A companion site, SmolCSS, offers minimal snippets for modern layouts and components.
Networking Toolbox is a developer resource for coding, documentation, communities, security research, or software tools.
