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Pa11y is a set of free and open source tools for automated accessibility testing of web pages. The command-line interface loads pages and highlights accessibility issues, while Pa11y Dashboard tests pages daily and graphs improvements and regressions. Pa11y Webservice is the JSON-based webservice behind the dashboard, and Pa11y CI iterates over a list of pages for use in CI.
Project CSV is a free, open-source web application for viewing and editing .csv files in a browser or offline. It processes file data locally on the user's device without sending it over the network or collecting other data. The application allows selecting .csv files, adjusting settings, generating editable tables, and downloading the edited table.
Project Wallace is a web-based CSS analyzer that examines stylesheets for complexity, specificity, performance and design tokens. Users paste a URL or raw CSS to receive a full analysis, a quality score, a design token audit and a custom property inspector, plus a cascade layer visualizer. Standalone tools include a CSS prettifier, minifier, diff viewer and specificity calculator.
SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
Sprite Fusion is an independent software company making tools for game development. Its tilemap editor is a free, web-based level design tool for crafting 2D tilemaps in the browser using any tileset, with auto-tiling, collisions and one-click exports to game engines. The company also offers a pixel art generator, a Pixel Snapper tool and an API.
Surge is a static web publishing service for front-end developers that deploys projects from the command line to a CDN. It offers free custom domain support, free SSL for surge.sh subdomains, pushState support for single page apps, custom 404.html pages, and a CLI. Projects can be deployed through build tools such as Grunt, Gulp, Git Hooks, and npm run scripts.
A collection of useful online web development tools, published at tiny-helpers.dev. Contributions are closed and pull requests are disabled, after the project was flooded with low-effort, AI-generated submissions. The project is licensed under MIT and uses Vercel's routing configuration.
Val Town is a platform for deploying code to live URLs. It supports cron jobs, REST APIs, webhooks, email, SQLite data storage, npm and Deno modules, and generating images and PDFs. A CLI allows editing code locally and deploying changes instantly, and AI coding tools can be used with it.
A handpicked collection of lightweight JavaScript plugins, components and libraries for use in web projects. The site indexes tools such as sliders, modal dialogs, select controls, date pickers, color pickers, image editors, animation libraries, charting libraries and lazy loaders, linking each to demo, source code and npm pages.
Visiwig is a site for finding design inspiration, exploring creative tools and shopping for graphics. It offers click-and-paste graphics such as icons, patterns and textures for website and brand visuals.
WAVE is a suite of evaluation tools that helps authors make web content more accessible. It can identify many accessibility and WCAG errors while facilitating human evaluation. WAVE is available as an online tool and as Chrome, Firefox, and Edge browser extensions for checking password-protected, locally stored, or highly dynamic pages. A subscription API and testing engine are also offered.
A website collecting cheat sheets, round-ups, quick reference cards and quick reference guides on a single page, organized by topics such as .NET, Ada, Adobe Systems, AJAX, Algebra and Amazon Web Services. Entries link to external PDF or HTML documents and list official project websites.
Codeberg is a non-profit, community-led effort providing services to free and open-source projects, including Git hosting using Forgejo, Pages, CI/CD and a Weblate instance. It is maintained by the non-profit organization Codeberg e.V., based in Berlin, Germany, and states it charges users no money and relies on optional donations. Its community includes developers, artists, academics, hobbyists and professionals.
A site offering side-by-side comparisons of programming languages and their compilers or runtimes. Benchmark tests are executed in a single CI job, and the static website is regenerated once a change is merged into the main branch. It aims to compare performance differences between languages and between compilers or runtimes of the same language.
125mb.com offers free web hosting with 24/7 support and support for PHP, Perl, CGI, Python and Ruby, plus domain registration, SSL certificates and VPS hosting. Paid shared, semi-dedicated and VPS hosting plans are also offered, with shared hosting starting at a monthly rate.
A site offering coding articles on topics such as Git, JavaScript and web development. The listing reports 694 articles, browsable by collection, with popular and latest content shown, including pieces on Git aliases, a JavaScript LeetCode solution and the Speculation Rules API.
Accessibility Cheatsheet is a page by Moritz Glantz offering practical approaches to Universal Design for making websites and webapps accessible to everyone. It covers semantic HTML, text alternatives for non-text content, form labels, visible focus indicators, sufficient contrast, descriptive links, captions and enabling pinch and zoom.
Anvil is a Python-based drag-and-drop web app builder. It provides a visual designer, Python in the browser and on the server, and one-click deployment. Apps are automatically hosted, and deployment environments map a URL or Uplink key to a version of the app with its configuration. Apps can be exported from the cloud editor and hosted on a computer using the open-source Anvil App Server.
The Apache HTTP Server is an open-source web server for modern operating systems. It offers flexible configuration, TLS/SSL and authentication modules, multi-processing modules, HTTP/2, content caching, reverse proxy support and more than 100 modules. It runs on Linux, Windows, macOS and most Unix-like systems. Version 2.4.69 was released 2026-10-01, and version 2.2 is end-of-life.
Astro is a JavaScript web framework for building content-driven websites. It renders components on the server and sends HTML to the browser, and it works with content from the file system, external APIs, or a CMS. It includes content collections, view transitions, optimized images, middleware, and deployment adapters.
Atheos is an open source, web-based cloud IDE and code editor built on top of Codiad. It has a small footprint, supports 40+ languages, and requires a server with Apache2 and PHP.
Automate the Boring Stuff with Python is a book by Al Sweigart, free to read under a Creative Commons license. It teaches Python fundamentals and projects for automating tasks such as searching the web, editing files and spreadsheets, and handling email.
BawkBox is a website widget service offering widgets such as customer reviews, feedback, public chatroom, polls, timer and lead capture. Widgets are installed by copying and pasting code, and the site states compatibility with platforms including Blogger, Wix, Drupal, Weebly and Squarespace. Free and paid plans are listed.
Biome is a web toolchain that formats and lints code, with the formatter covering JavaScript, TypeScript, JSX, TSX, JSON, HTML, CSS, SCSS, GraphQL, YAML and Markdown at 97% compatibility with Prettier, and the linter offering 607 rules from ESLint, TypeScript ESLint and other sources. A single check command runs formatter, linter and assist actions.
