Marvin Frachet

pierre. pierre’s open source code

glimpse. Native micro Web UI for scripts and agents — super fast OS native webview with bidirectional JSON communication for agents

IDX0. Stay in flow. Ship from the terminal.

pretext. Fast, accurate & comprehensive text measurement & layout

claude-hud. A Claude Code plugin that shows what's happening - context usage, active tools, running agents, and todo progress

flag-engine. A feature flags evaluation engine, runtime agnostic with no remote services.

12-factor-agents. What are the principles we can use to build LLM-powered software that is actually good enough to put in the hands of production customers?

broken-link-checker. Find broken links, missing images, etc within your HTML.

linkchecker. check links in web documents or full websites

Prompt-Engineering-Guide. 🐙 Guides, papers, lessons, notebooks and resources for prompt engineering, context engineering, RAG, and AI Agents.

syncpack. Consistent dependency versions in large JavaScript Monorepos.

stripe-recommendations. How to implement Stripe without going mad

evalite. Evaluate your LLM-powered apps with TypeScript

mastra. Mastra is the modern TypeScript framework for AI-powered applications and agents.

react-scan. Scan and fix React performance issues

awesome-freelance-fr. :sunglasses: Curated list of awesome tools to build your freelance career (in france)

client-side-rendering. A case study of CSR.

posthog. :hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error tracking, logs, and more – capture all the context agents need to diagnose problems, uncover opportunities, and ship fixes. Steer it all from Slack, web, desktop, or the MCP.

rrweb. record and replay the web

dive. A tool for exploring each layer in a docker image

ip-location-db. ip to location database by ASN, GeoFeed, Whois, iptoasn.com, db-ip lite, GeoLite2

njt. njt (npm jump to): a quick navigation tool for npm packages

expressive-code. A text marking & annotation engine for presenting source code on the web.

system-design. Learn how to design systems at scale and prepare for system design interviews

starlight-blog. Starlight plugin to add a blog to your documentation

generouted. Generated file-based routes for Vite

guidepup. Screen reader automation library for testing.

whatever. Whatever it will be

deoptigate. ⏱️ Investigates v8/Node.js function deoptimizations.

shortvid.io. Repository to generate meetup trailers for social network like Twitter, Reddit, Slack to announce speakers and talks and sponsors 📣

lunapark. 🎡 The most advanced visual scripting editor for the web.

astro-form-actions. Forms in Astro made easy

astro. The web framework for content-driven websites. ⭐️ Star to support our work!

httpstat. curl statistics made simple

react-use. React Hooks — 👍

fontpie. Get your layout shifts optimized with a CLI-generated piece of CSS

progressively. The Open Source Product Control Tower

loadable-components. The recommended Code Splitting library for React ✂️✨

storage-partitioning. Client-Side Storage Partitioning

setup. Setup instructions for Le Wagon's students on their first day of AI Software Development Bootcamp

devops-exercises. Linux, Jenkins, AWS, SRE, Prometheus, Docker, Python, Ansible, Git, Kubernetes, Terraform, OpenStack, SQL, NoSQL, Azure, GCP, DNS, Elastic, Network, Virtualization. DevOps Interview Questions

progressively. (In progress) personal feature flag solution

jest-preview. Debug your Jest tests. Effortlessly.🛠🖼

ws. Simple to use, blazing fast and thoroughly tested WebSocket client and server for Node.js

AppFlowy. Bring projects, wikis, and teams together with AI. AppFlowy is the AI collaborative workspace where you achieve more without losing control of your data. The leading open source Notion alternative.

simple-auth-example. Test case for using SessionStorage based authentication with Cypress and Lighthouse

web. Guides, tools and libraries for modern web development.

DevToys. A Swiss Army knife for developers.

pastel. A command-line tool to generate, analyze, convert and manipulate colors

forma-36. A design system by Contentful

fontsource. Self-host Open Source fonts in neatly bundled NPM packages.

voiceover.js. [moved to https://github.com/AccessLint/screenreaders]

cypress-sitemap-urls. Retrieve all the URLs of a sitemap.xml document

cypress-pseudo-localization. Switch all the text content to a pseudo localized variant of it

wcag. Web Content Accessibility Guidelines

react-figma. ⚛️ A React renderer for Figma

remix. Build Better Websites. Create modern, resilient user experiences with web fundamentals.

Modernizr. Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

just. A library of dependency-free JavaScript utilities that do just one thing.

main-thread-scheduling. Fast and consistently responsive apps using a single function call

cors-playground. TypeScript

accessible_components. Listing of accessible components & patterns

shiki. A beautiful yet powerful syntax highlighter

sous-titres. Liste des outils pour sous-titrer vos vidéos et podcasts

htmlrecipes. A collection of quick copy HTML snippets for a variety of common scenarios.

autocannon. fast HTTP/1.1 benchmarking tool written in Node.js

a11ysupport.io. Accessibility Support data for various HTML, ARIA, CSS, and SVG features

screenreaders. Screen reader automation tools by AccessLint, including VoiceOver.js and Auto-VO

accessibility_interview_questions. A starting point for questions to ask someone that wants you to give them a job

argos. docker monitoring experiment

awesome-scalability. The Patterns of Scalable, Reliable, and Performant Large-Scale Systems

pseudo-localization. Dynamic pseudo-localization in the browser and nodejs

NVDARemote. The NVDA Remote Access add-on

nvda-testing-driver. Build functional tests using a screen reader

focus-rings. A centralized system for displaying and stylizing focus indicators anywhere on a webpage.

webcrypto-examples. Web Cryptography API Examples Demo: https://diafygi.github.io/webcrypto-examples/

alpine. A rugged, minimal framework for composing JavaScript behavior in your markup.

deepLearningBook-Notes. Notes on the Deep Learning book from Ian Goodfellow, Yoshua Bengio and Aaron Courville (2016)

architecture-decision-record. Architecture decision record (ADR) examples for software planning, IT leadership, and template documentation

Production-Level-Deep-Learning. A guideline for building practical production-level deep learning systems to be deployed in real world applications.

web-vitals. Essential metrics for a healthy site.

adr-tools. Command-line tools for working with Architecture Decision Records

theme-specification. A specification for defining theme objects & design tokens for use with UI components

why-did-you-render. why-did-you-render by Welldone Software monkey patches React to notify you about potentially avoidable re-renders. (Works with React Native as well.)

list. List of Homeferences

tools. Unified developer tools for JavaScript, TypeScript, and the web

contributing-tests.

cypress-audit. ⚡ Run Lighthouse and Pa11y audits directly in your E2E test suites

twitter-dev-salaries-scraper. https://docs.google.com/spreadsheets/d/1-xIgk7Mw1S5DXTZSbKBgxlsQAn7XGIu7Mfy72lSVHKk/edit?usp=sharing

playwright. Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

awesome-web-animation. A list of awesome web animation libraries, books, apps etc.

reconciled. ⚛️ Simple way to create a custom React renderer

frontend-playbook. The Frontend Playbook

Front-End-Performance-Checklist. 🎮 The only Front-End Performance Checklist that runs faster than the others

jest-image-snapshot. ✨ Jest matcher for image comparisons. Most commonly used for visual regression testing.

react-focus-lock. It is a trap! A lock for a Focus. 🔓

gatsby. React-based framework with performance, scalability, and security built in.

action-sheet-rn. Probably the most declarative API for ActionSheets in React Native

node-express-realworld-example-app. TypeScript

css. Primer is GitHub's design system. This is the CSS implementation

scheduling-apis. APIs for scheduling and controlling prioritized tasks.

medium-to-own-blog. Switch from Medium to your own blog in a few minutes

css-only-chat. A truly monstrous async web chat using no JS whatsoever on the frontend

go-perfbook. Thoughts on Go performance optimization

baseweb. A React Component library implementing the Base design language

golang-developer-roadmap. Roadmap to becoming a Go developer in 2020

svelte. web development for the rest of us

termshark. A terminal UI for tshark, inspired by Wireshark

project-layout. Standard Go Project Layout

json-server. Get a full fake REST API with zero coding in less than 30 seconds (seriously)

996.ICU. Repo for counting stars and contributing. Press F to pay respect to glorious developers.

vue-9-perf-secrets. Demos from my talk "9 performance secrets revealed"

open-blog.dev. Open publication where you can share your blog post freely

majestic. ⚡ Zero config GUI for Jest

htm. Hyperscript Tagged Markup: JSX alternative using standard tagged templates, with compiler support.

hooks. React Native APIs turned into React Hooks for use in functional React components

react-wasm. Declarative WebAssembly instantiation for React

marktext. 📝A simple and elegant markdown editor, available for Linux, macOS and Windows.

nodebestpractices. ✅ The Node.js best practices list (July 2026)

quicklink. ⚡️Faster subsequent page-loads by prefetching in-viewport links during idle time

koache. Koa middleware for caching response, based on node-cache

poc-fiber. HTML

server-push-hooks. 🔥 React hooks for Socket.io, SSE, WebSockets and more to come

use-redux. JavaScript

vanilla-modern-js. Experimental Web app using no framework, no external source code, but all fancy new standards ;)

the-platform. Web. Components. 😂

React-Fiber-Architecture. Understanding the structure of React Fiber( walk through and pseudo-code)

event-loop. Deep dive into JavaScript event loop

golang-wasm. Playing around with Go wasm support

go-vdom-wasm. WASM VDOM to create frontend application using Go

go-wasm-cli. Minimalistic cli to create and run (with hot reload) Go application targeting WASM

math-as-code. a cheat-sheet for mathematical notation in code form

bat. A cat(1) clone with wings.

worker-dom. The same DOM API and Frameworks you know, but in a Web Worker.

awesome-react-renderer. Awesome list of React Renderer

react-loadable. :hourglass_flowing_sand: A higher order component for loading components with promises.

axe-core. Accessibility engine for automated Web UI testing

fantasy-land. Specification for interoperability of common algebraic structures in JavaScript

go-patterns. Curated list of Go design patterns, recipes and idioms

bugs-zero-kata. JavaScript

build-your-own-x. Master programming by recreating your favorite technologies from scratch.

minipack. 📦 A simplified example of a modern module bundler written in JavaScript

fabriqueDev. Emportez votre fabrique de dev

Inquirer.js. A collection of common interactive command line user interfaces.

yargs. yargs the modern, pirate-themed successor to optimist.

loupe. Visualizing the javascript runtime at runtime

i18n-tools. ⛔️ [DEPRECATED] M6 WEB's i18n packages

fkill-cli. Fabulously kill processes. Cross-platform.

chrome-remote-interface. Chrome Debugging Protocol interface for Node.js

prompts. ❯ Lightweight, beautiful and user-friendly interactive prompts

hands-on-vue. Codelab vue.js

gravitron. a little game

the-super-tiny-compiler. :snowman: Possibly the smallest compiler ever

profile-summary-for-github. Tool for visualizing GitHub profiles

nodejs-dashboard. Telemetry dashboard for node.js apps from the terminal!

rn-displayable. :computer: :dash: Make your component visible with animations and a set of rules or simple props

must-watch-javascript. 🔥 JavaScript talks you have to see 📺 on functional programming, performance, frameworks, React, debugging, leveling up, and more! ⚡️

hotrod. JavaScript

stacks-cli. 📊 Analyze website stack from the terminal 💻

babel-handbook. :blue_book: A guided handbook on how to use Babel and how to create plugins for Babel.

node_acl. Access control lists for node applications

rn-render-perfs. :zap: :cyclone: Measure React rendering lifecycles using controls

awesome-regression-testing. 🕶️ A curated list of resources around the topic: visual regression testing

Making-a-custom-React-renderer. Tutorial on how to make a custom React renderer

androidmvp. MVP Android Example

react-native-material-palette. Bringing Material Palette API to React Native

detox-example. A try to use every APIs provided by Wix Detox concerning expectations, actions and matchers

Detox. Gray box end-to-end testing and automation framework for mobile apps

react-native. A framework for building native applications using React

haul. Haul is a command line tool for developing React Native apps, powered by Webpack

proposal-binary-ast. Binary AST proposal for ECMAScript

react-native-web. Cross-platform React UI packages

react-primitives. Primitive React Interfaces Across Targets

ink. 🌈 React for interactive command-line apps

rn-ab-hoc. :two_men_holding_hands: :two_women_holding_hands: Poor intrusive way to make A/B Testing by using an HoC instead of components

rn-placeholder. 🏖️ Display some placeholder stuff before rendering your text or media content in React Native

generator-rancher-catalog. Yeoman generator for creating catalog template for Rancher

react-bits. ✨ React patterns, techniques, tips and tricks ✨

lottie-react-native. Lottie wrapper for React Native.

scribbletune. Create music with JavaScript

yarn. The 1.x line is frozen - features and bugfixes now happen on https://github.com/yarnpkg/berry

functional-programming-jargon. Jargon from the functional programming world in simple terms!

react-in-patterns. A free book that talks about design patterns/techniques used while developing with React.

redux. A JS library for predictable global state management

public-apis. A collective list of free APIs

react-redux-starter-kit. Get started with React, Redux, and React-Router.

react-slingshot. React + Redux starter kit / boilerplate with Babel, hot reloading, testing, linting and a working example app built in