How to: JavaScript
- [altair](https://github.com/imolorhe/altair) _(label: good first issue)_
A beautiful feature-rich GraphQL Client for all platforms.
- [Ancient Beast](https://github.com/FreezingMoon/AncientBeast) _(label: easy)_
Turn based strategy game where you 3d print a squad of creatures with unique abilities in order to defeat your enemies.
- [appsmith](https://github.com/appsmithorg/appsmith) _(label: good first issue)_
Drag & Drop internal tool builder
- [AVA](https://github.com/sindresorhus/ava) _(label: good-for-beginner)_
Futuristic test runner.
- [Babel](https://github.com/babel/babel) _(label: good first issue)_
A compiler for writing next generation JavaScript.
- [Berry - Active development trunk for Yarn](https://github.com/yarnpkg/berry) _(label: good first issue)_
Fast, reliable, and secure dependency management.
- [Botpress](https://github.com/botpress/botpress) _(label: contributor-friendly)_
The only sane way to build great bots.
- [Brave Browser](https://github.com/brave/brave-browser) _(label: good first issue)_
Desktop browser for macOS, Windows, and Linux.
- [Check It Out](https://github.com/jwu910/check-it-out) _(label: good first issue)_
Check It Out is an ncurses-like CLI to let the user interactively navigate and select a git branch to check out.
- [Create React App](https://github.com/facebook/create-react-app) _(label: good first issue)_
Create React apps with no build configuration.
- [cypress](https://github.com/cypress-io/cypress) _(label: good first issue)_
Fast, easy and reliable testing for anything that runs in a browser.
- [electron](https://github.com/electron/electron) _(label: good first issue)_
Build cross platform desktop apps with JavaScript, HTML, and CSS
- [Ember.js](https://github.com/emberjs/ember.js) _(label: Good-for-New-Contributors)_
A JavaScript framework for creating ambitious web applications.
- [Ember.js Data](https://github.com/emberjs/data) _(label: Good-for-New-Contributors)_
A data persistence library for Ember.js.
- [ESLint](https://github.com/eslint/eslint) _(label: good first issue)_
A fully pluggable tool for identifying and reporting on patterns in JavaScript.
- [eslint-plugin-unicorn](https://github.com/sindresorhus/eslint-plugin-unicorn) _(label: good-for-beginner)_
Awesome ESLint rules.
- [Fastify](https://github.com/fastify/fastify) _(label: good first issue)_
Fast and low overhead web framework, for Node.js.
- [freeCodeCamp](https://github.com/freeCodeCamp/freeCodeCamp) _(label: first-timers-only)_
Open source codebase and curriculum. Learn to code and help nonprofits.
- [Gatsby.js](https://github.com/gatsbyjs/gatsby) _(label: good first issue)_
Build blazing fast, modern apps and websites with React.
- [Ghost](https://github.com/TryGhost/Ghost) _(label: good first issue)_
Just a blogging platform
- [grommet](https://github.com/grommet/grommet) _(label: good first issue)_
a react-based framework that provides accessibility, modularity, responsiveness, and theming in a tidy package
- [Habitica](https://github.com/HabitRPG/habitica) _(label: good first issue)_
Habitica is a gamified task manager, webapp and android/ios app, really wonderful atmosphere. Guidance for contributing here (mongo, express, vue, node stack for webapp)
- [HMPL](https://github.com/hmpl-language/hmpl) _(label: good first issue)_
Server-oriented customizable templating for JavaScript.
- [Hoppscotch](https://github.com/hoppscotch/hoppscotch) _(label: good first issue)_
A free, fast and beautiful API request builder.
- [HueHive](https://github.com/croma-app/croma) _(label: good first issue)_
An open source react native app iOS and android for color palette management
- [iD](https://github.com/openstreetmap/iD) _(label: new contributor opportunity)_
The easy-to-use OpenStreetMap editor in JavaScript.
- [ImprovedTube](https://github.com/code-charity/youtube) _(label: good first issue)_
A powerful but lightweight extension, to enrich your video experience & enable your content selection.
- [Jasmine](https://github.com/jasmine/jasmine) _(label: good first issue)_
Simple JavaScript testing framework for browsers and node.js.
- [Jest](https://github.com/facebook/jest) _(label: good first issue)_
A complete and easy to set up JavaScript testing solution.
- [Kinto.js](https://github.com/Kinto/kinto.js) _(label: easy-pick)_
An offline-first JavaScript client leveraging the Kinto API for remote data synchronization.
- [Leaflet](https://github.com/Leaflet/Leaflet) _(label: good first issue)_
JavaScript library for mobile-friendly interactive maps.
- [material-ui](https://github.com/mui/material-ui) _(label: good first issue)_
React components for faster and easier web development. Build your own design system, or start with Material Design.
- [Mattermost](https://github.com/mattermost/mattermost) _(label: Good First Issue, Difficulty/1:Eas