web
Effortlessly Save and Preserve Web Pages. Web Extension for saving a faithful copy of a complete web page in a single HTML file.
SingleFile is a browser extension that allows you to save an entire web page, including all its resources (e.g., images, stylesheets, fonts, frames, etc.), as a single HTML file with just one click.
The saved page can be displayed offline in any browser without needing to install any extension. Ideal for researchers, students, and professionals needing reliable offline copies of web pages, or for anyone wanting to keep a record of their favorite web content.
SingleFile is available for Chrome, Edge, Firefox, and Safari. It is free and open source.
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Open Source Video Player.
open source media player framework for Web and React. Modern, modular, and composable media player framework for Web and React.
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Terminal apps that run anywhere - even the browser!
Build terminal apps that run in the browser (and the terminal) with React. The Gridland website is built with Gridland.
Gridland is built on the OpenTUI rendering engine.
Property-based testing for web UIs, autonomously exploring and validating correctness properties, finding harder bugs earlier.
Runs in your local developer environment, in CI, and inside Antithesis.
Automate your web typography workflow with this Composer dev-tool. 🚀
Converts TTF fonts to optimized WOFF2 subsets using Python FontTools. Works with Laravel, Symfony, and vanilla PHP projects.
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Converts PNG/JPG images to AVIF, WebP and JPG in multiple sizes. Automate your web image workflow with this Composer dev-tool. 🚀 .
Works with Laravel, Symfony, and vanilla PHP projects.
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Named .localhost URLs for Development. Replace port numbers with stable, named local URLs. For humans and agents.
Portless replaces port numbers with stable, named .localhost URLs for local development. For humans and agents.
End-to-End UI Testing for Mobile and Web.
Maestro makes UI testing dead simple. Write your first test in under 5 minutes. Maestro is an open-source framework that makes UI and end-to-end testing for Android, iOS, and web apps simple and fast. Write your first test in under five minutes using YAML flows and run them on any emulator, simulator, or browser.
A unified TypeScript SDK for building chat bots across Slack, Microsoft Teams, Google Chat, Discord, Telegram, GitHub, Linear, and WhatsApp. Write your bot logic once, deploy everywhere.
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Optimising Web Delivery.
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.
Looking for inspiration? Browse our curated collection of HTML UI components ready to drop into your next project.
In December 1990, an application called WorldWideWeb was developed on a NeXT machine at The European Organization for Nuclear Research (known as CERN) just outside of Geneva. This program – WorldWideWeb — is the antecedent of most of what we consider or know of as "the web" today.
In February 2019, in celebration of the thirtieth anniversary of the development of WorldWideWeb, a group of developers and designers convened at CERN to rebuild the original browser within a contemporary browser, allowing users around the world to experience the rather humble origins of this transformative technology.
Arduino (8-bit AVR) simulator, written in JavaScript and runs in the browser / Node.js
Super-configurable and well-tested web page minifier (enhanced successor of HTML Minifier).
The WebMCP API enables web applications to provide JavaScript-based tools to AI agents.
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Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.
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Stable. Lightweight. Instantly Familiar.
A lightweight, stable, instantly familiar free open-source content management system. Forked from WordPress without the block editor (Gutenberg).
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A Tool to Redirect News, Search, Widgets, Weather and More to Your Default Browser.
This tool filters and passes the command line arguments of Microsoft Edge processes into your default browser instead of hooking into the microsoft-edge: handler, this should provide resiliency against future changes. Additionally, an Image File Execution Options mode is available to operate similarly to the Old EdgeDeflector. Additional modes are planned for future versions.
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holistic Visual Regression Testing cloud. Open source alternative to Percy, Chromatic, Applitools.
Lost Pixel is an open-source visual regression testing tool. Run visual regression tests on your Storybook and Ladle stories and your application pages.
Cowork-like experience in the browser using filesystem api.
An AI-powered file system manager built with the File System Access API. Co-do lets you select a folder on your local machine and use AI to perform operations on the files within.
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WebAssembly for the Modern Web.
A type-safe, component-based language for building high-performance web apps with WASM and fine-grained reactivity.
A framework for finding JavaScript memory leaks and analyzing heap snapshots. Analyzes JavaScript heap and finds memory leaks in browser and node.js.
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✅ ESLint plugin to enforce the JavaScript Baseline.
Default to the Web Platform Baseline, the cross‑browser compatibility standard. Ship code that works for everyone.
A command-line utility for taking automated screenshots of websites.
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HTML as Template Language.
EHTML transforms standard HTML into a powerful application layer. Write less JavaScript and let HTML handle templating, data loading, rendering, and interactions.
Nostalgist.js is a JavaScript library that allows you to run emulators of retro consoles like NES and Sega Genesis, within web browsers.
Barcode scanning for web apps.
STRICH is a JavaScript library for real-time, 1D/2D barcode scanning in the web browser.
Complete media toolkit.
Pure TypeScript media toolkit for reading, writing, and converting video and audio files, directly in the browser.
A JavaScript library for reading, writing, and converting video and audio files. Directly in the browser, and faster than anybunny else.
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Layrr is the visual editor for real code. Design visually, edit any stack, own everything. A browser coding agent interface for selecting elements and sending instructions directly to Claude Code.
Lightweight type coercion library.
Of Coerce! is a lightweight, near-zero overhead alternative to Zod and Valibot.
Unlike these libraries, Of Coerce! focuses on a single task: ensuring the data corresponds to the types.
It uses built-in JavaScript features to coerce whatever you pass to it, which makes it the fastest and the most lightweight solution (full library is 381B!).
Actor-based state management & orchestration for complex app logic. XState is a state management and orchestration solution for JavaScript and TypeScript apps.
It uses event-driven programming, state machines, statecharts, and the actor model to handle complex logic in predictable, robust, and visual ways. XState provides a powerful and flexible way to manage application and workflow state by allowing developers to model logic as actors and state machines. It integrates well with React, Vue, Svelte, and other frameworks and can be used in the frontend, backend, or wherever JavaScript runs.
Wirebrowser is a debugging, interception, and memory-inspection toolkit powered by the Chrome DevTools Protocol (CDP). It unifies network manipulation, API testing, automation scripting, and deep JavaScript memory inspection into one interface. With features like Breakpoint-Driven Heap Search and real-time Live Object Search, Wirebrowser provides researchers and engineers with precise, high-visibility tools for client-side analysis, reverse engineering, and complex application debugging.
CSS voxel engine for the DOM.
A CSS voxel engine. A 3D grid for the DOM. Renders HTML cuboids by stacking CSS grid layers and applying transforms.
Supports colors and textures, interactions and culling, plus shapes, areas and projections. All without </canvas>.
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The open protocol for real-time sync to client applications.
HTTP-based durable streams for streaming data reliably to web browsers, mobile apps, and native clients with offset-based resumability.
Durable Streams provides a simple, production-proven protocol for creating and consuming ordered, replayable data streams with support for catch-up reads and live tailing.
Make images smaller using best-in-class codecs, right in the browser.
Squoosh is an image compression web app that reduces image sizes through numerous formats. Squoosh does not send your image to a server. All image compression processes locally.
True offline-first sync for modern apps—without vendor lock-in.
🔄 A powerful, type-safe sync engine for building real-time collaborative applications. Local-first, CRDT-based, with zero-config offline support.
Web Cache Vulnerability Scanner is a Go-based CLI tool for testing for web cache poisoning and web cache deception.
The scanner supports many different web cache poisoning and web cache deception techniques, includes a crawler to identify further URLs to test, and can adapt to a specific web cache for more efficient testing. It is highly customizable and can be easily integrated into existing CI/CD pipelines.
interactive, collaborative html elements with a single data attribute.
playhtml is an open-source library for designing communal web experiences by enhancing web elements with real-time, collaborative interactivity.
Why does the internet feel lonely when we increasingly spend much of our time on it? I think it's because most of the internet is a solitary experience, by design: personal algorithmic feeds, content-focused websites, no indicator of who else is here with us right now.
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trifold is a tool to serve static websites using a content delivery network (CDN).
This allows painless deployment of sites consisting entirely of static assets (HTML, CSS, JS, images) for pennies a month. It is the perfect companion to deploy sites built with static-site generators like Hugo, Zola, Quarto, or zensical.
A fast, framework-agnostic undo/redo core powered by Mutative JSON Patch.
A fast, framework-agnostic undo/redo library that stores only changes, not full snapshots.
Travels gives your users the power to undo and redo their actions—essential for text editors, drawing apps, form builders, and any interactive application. Unlike traditional undo systems that copy entire state objects for each change, Travels stores only the differences (JSON Patches), making it 10x faster and far more memory-efficient.
ssh-first fediverse blog. Blog directly from ssh!
stegodon is an SSH-first federated blogging platform. Users connect via SSH to create notes in a terminal interface. Notes federate to the Fediverse via ActivityPub and are available through RSS feeds and a web interface.
AI Browser Automation. Automate browser based workflows with AI.
Skyvern automates browser-based workflows using LLMs and computer vision. It provides a simple API endpoint to fully automate manual workflows on a large number of websites, replacing brittle or unreliable automation solutions.
The current sky at your approximate location, rendered as a CSS gradient.
A high-quality visual cross-platform gemini browser.
Kristall is a browser without support for css/js/wasm or graphical websites. It can display user-styled documents in several formats, including gemini, html, markdown, … provided by a server via gemini, gopher, http, finger, …
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fuite is a CLI tool for finding memory leaks in web apps.
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A modern static site generator by the creators of Material for MkDocsh
Zensical is a fresh take on what we envision a modern Open Source toolchain to build static sites should look like. Brought to you by the creators of Material for MkDocs – a tool trusted by more than 70,000 projects worldwide – we're building Zensical from first principles to achieve faster iteration, better authoring experience, and a modern architecture that scales with your needs.
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jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.
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A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
A declarative, HTML‑based language that makes building web apps fun.
Marko is HTML re‑imagined as a language for building dynamic and reactive user interfaces.
Just about any valid HTML is valid Marko, but Marko extends the HTML language to allow building modern applications in a declarative way.
Visually explore, understand, and present your data.
By using easy-to-understand views, SandDance helps you find insights about your data, which in turn help you tell stories supported by data, build cases based on evidence, test hypotheses, dig deeper into surface explanations, support decisions for purchases, or relate data into a wider, real world context.
Fast, unopinionated, minimalist web framework for Node.js
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Pronounced "Alix".
This CSS file intends to warn developers about possible risks and mistakes that exist in HTML code. It can also be used to roughly evaluate a site's quality by simply including it as an external stylesheet.
CSS files are available in French, English, Spanish, Greek, Arabic, Portuguese, Russian, Chinese, Polish and Dutch — and leveled or full.
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Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine.
Internet Archive is a non-profit library of millions of free texts, movies, software, music, websites, and more.
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Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind. It’s used in millions of websites, including some of those you visit daily.
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Firefox Reader View in your terminal! - CLI tool for Mozilla's Readability library.
readability-cli takes any HTML page and strips out unnecessary bloat by using Mozilla's Readability library. As a result, you get a web page which contains only the core content and nothing more. The resulting HTML is suitable for terminal browsers, text readers, and other uses.
Daux.io is a documentation generator that uses a simple folder structure and Markdown files to create custom documentation on the fly. It helps you create great looking documentation in a developer friendly way.