If you are a maintainer of open-source projects, add the label first-timers-only (or similar) to your project and list it here so that people can find it.
Legerity(label: good first issue) A framework for speeding up the development of automated UI tests for Windows, Android, iOS, and Web with Appium/Selenium on .NET.
MvvmCross(label: first-timers-only) The .NET MVVM framework for cross-platform solutions, including Xamarin.iOS, Xamarin.Android, Windows and Mac.
Oppia(label: good first issue) Oppia is an open-source project whose aim is to empower learners across the globe by providing access to high-quality, engaging education. We envision a society in which access to high-quality education is a human right rather than a privilege.
Cake(label: Good-first-issue) Cake (C# Make) is a free and open source cross-platform build automation system with a C# DSL for tasks such as compiling code, copying files and folders, running unit tests, compressing files and building NuGet packages.
osu!(label: good first issue) Music game. Rhythm is just a click away!
Spectre.Console(label: good first issue) A .NET library that makes it easier to create beautiful console applications.
Uno Platform(label: good first issue) OSS project for creating pixel-perfect, single-source C# and XAML apps which run natively on iOS, Android, macOS, Linux and Web via WebAssembly.
electron(label: good first issue) Build cross platform desktop apps with JavaScript, HTML, and CSS
F3D(label: good first issue) Fast and minimalist 3D viewer.
Godot Engine(label: good first issue) 2D and 3D cross-platform game engine. Also has C# and Python code.
Julia(label: good first issue) The Julia Programming Language - A high-level, high-performance dynamic language for technical computing.
MiniOB(label: good first issue) MiniOB is a compact database that assists developers in understanding the fundamental workings of a database(main language is Chinese).
MoveIt(label: good first issue) Easy-to-use open source robotics manipulation platform for developing commercial applications, prototyping designs, and benchmarking algorithms.
projectM(label: good first issue) A music visualizer library using OpenGL and GLSL. Has applications using Qt5, SDL, emscripten, iTunes, Kodi.
Roc Toolkit(label: help-wanted) A toolkit for real-time audio streaming over the network.
tensorflow(label: stat:contributions-welcome) Computation using data flow graphs for scalable machine learning
Yugabyte DB(label: good first issue) Distributed SQL database.
dart.dev(label: beginner) A website covering Dart language and common libraries, for developers of Dart libraries, web apps, server-side code, and mobile (Flutter) apps.
flutter(label: good first issue) Flutter is Google’s UI toolkit for building beautiful, natively compiled applications for mobile, web, desktop, and embedded devices from a single codebase.
OpenFoodFacts(label: good first issue) Collaborative, free and open database of food products from around the world. Scan barcode to get info or add a product
PureLB(label: n/a) Load-balancer orchestrator for Kubernetes that uses standard Linux networking and routing protocols.
script(label: good first issue) A Go library for doing the kind of tasks that shell scripts are good at: reading files, executing subprocesses, counting lines, matching strings, and so on. Beginners are very welcome and will get detailed code review and help through the PR process.
SigNoz(label: good first issue) An Open Source observability platform that monitors your applications and services. It comes with out-of-box charts for key application metrics like p99 latency, error rate, Apdex, and operations per second. You can also monitor the database and external calls made from your application.
Terraform(label: good first issue) A tool for building, changing, and versioning infrastructure safely and efficiently.
TiDB(label: good first issue) A distributed scalable Hybrid Transactional and Analytical Processing (HTAP) database
utils(label: good first issue) Common Utilities library for Go
Hasura GraphQL Engine(label: good first issue) Blazing fast, instant realtime GraphQL APIs on Postgres with fine grained access control, also trigger webhooks on database events.
Catima - Android App(label: good first issue) Catima, a Loyalty Card & Ticket Manager for Android
Codename One(label: good first issue) Cross-platform mobile app development framework for Java developers
DSA(label: good first issue) DSA questions practising repo for Java developers
elasticsearch(label: good first issue) Open Source, Distributed, RESTful Search Engine.
JabRef(label: good first issue) Desktop application for managing literature references using modern Java features including JavaFX. Dedicated to code quality and constructive feedback: Each Pull Request is reviewed by two developers to provide high-quality feedback and to ensure high quality of new contributions.
OpenMetadata(label: good first issue) OpenMetadata is an all-in-one platform for data discovery, data quality, observability, governance, data lineage, and team collaboration.
QuestDB(label: Good first issue) Questdb is a fast open source SQL time series database.
TEAMMATES(label: good first issue) TEAMMATES is a free online tool for managing peer evaluations and other feedback paths of your students.
Trino (formerly Presto SQL)(label: good first issue) A distributed SQL query engine for big data. Ask for guidance on project’s Slack.
Wikimedia Commons Android App(label: good first issue) Allows users to upload pictures from their Android phone/tablet to Wikimedia Commons.
XWiki(label: onboarding) XWiki is a free wiki software platform written in Java with a design emphasis on extensibility. Beginners should follow the onboarding wiki.
zerocode(label: good first issue) API Automation without coding, easy JSON response assertions, Testing REST, SOAP, Kafka and Java/DB APIs, CI/Jenkins Friendly.
Fastify(label: good first issue) Fast and low overhead web framework, for Node.js.
freeCodeCamp(label: first-timers-only) Open source codebase and curriculum. Learn to code and help nonprofits.
Gatsby.js(label: good first issue) Build blazing fast, modern apps and websites with React.
Ghost(label: good first issue) Just a blogging platform
grommet(label: good first issue) a react-based framework that provides accessibility, modularity, responsiveness, and theming in a tidy package
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(label: good first issue) Server-oriented customizable templating for JavaScript.
Hoppscotch(label: good first issue) A free, fast and beautiful API request builder.
HueHive(label: good first issue) An open source react native app iOS and android for color palette management
iD(label: new contributor opportunity) The easy-to-use OpenStreetMap editor in JavaScript.
ImprovedTube(label: good first issue) A powerful but lightweight extension, to enrich your video experience & enable your content selection.
Jasmine(label: good first issue) Simple JavaScript testing framework for browsers and node.js.
Jest(label: good first issue) A complete and easy to set up JavaScript testing solution.
Kinto.js(label: easy-pick) An offline-first JavaScript client leveraging the Kinto API for remote data synchronization.
Leaflet(label: good first issue) JavaScript library for mobile-friendly interactive maps.
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(label: Good First Issue, Difficulty/1:Easy) Open source Slack-alternative in Golang and React Look for issues labelled ‘Up For Grabs’
Meteor(label: good first issue) Meteor is an ultra-simple environment for building modern web applications.
Mocha(label: good first issue) Javascript test framework for Node.js and the browser.
Moment.js(label: Up-For-Grabs) A lightweight JavaScript date library for parsing, validating, manipulating, and formatting dates.
name-suggestion-index(label: good first issue) Canonical common brand names for OpenStreetMap
NativeScript(label: good first issue) NativeScript is an open source framework for building truly native mobile apps with JavaScript. Use web skills, like Angular and Vue.js, FlexBox and CSS, and get native UI and performance on iOS and Android.
netlify-cms(label: good first issue) Open source content management for your git workflow.
Next.js(label: good first issue) A minimalistic framework for universal server-rendered React applications
Node.js core(label: good first issue) JavaScript runtime built on Chrome’s V8 JavaScript engine
nuclear(label: good first issue) Multiplatform music player that streams from free sources.
p5.js(label: good first issue) p5.js is a client-side JS platform that empowers artists, designers, students, and anyone to learn to code and express themselves creatively on the web.
pixi.js(label: 🤩 Good First PR) A 2D JavaScript Renderer
PouchDB(label: help-wanted) PouchDB is a pocket-sized database.
ramda-adjunct(label: help-wanted) Ramda Adjunct is the most popular and most comprehensive set of functional utilities for use with Ramda, providing a variety of useful, well tested functions with excellent documentation.
Rawsec Cybersecurity Inventory(label: difficulty::easy) An inventory of tools and resources that aims to help people to find everything related to CyberSecurity.
React(label: good first issue) A declarative, efficient, and flexible JavaScript library for building user interfaces.
React Native(label: Good-first-issue) A framework for building native apps with React.
ReactiveSearch(label: good first issue-:wave:) A UI components library for Elasticsearch: Available for React, Vue and React Native.
reactjs.org(label: good first issue) The documentation website for reactjs
serverless(label: good first issue) The Serverless Framework
Storybook JS(label: good first issue) Storybook is a frontend workshop for building UI components and pages in isolation.
stryker(label: 👶 Good first issue) The JavaScript mutation testing framework
Svelte(label: good first issue) Component framework that runs at build time, converting your components into highly efficient imperative code that surgically updates the DOM.
swag-for-dev(label: good first issue) Swag opportunities for developers.
The Odin Project Curriculum(label: See Description) An open-source curriculum for learning full-stack web development. There are a few “Type: Good First Issue” labelled issues, but any content addition/deletion issues seem reasonably beginner friendly.
Time to Leave(label: good first issue) Working hours time tracker app based on Electron and Javascript.
Vest(label: good first issue) Validations framework inspired by unit testing frameworks.
Video Hub App(label: good first issue) Angular & Electron app for browsing and searching videos on your PC.
Video.js(label: good first issue) The player framework
Vite(label: good first issue) Next generation frontend tooling. It’s fast! Alternative to Create React App
Vue Router(label: good first issue) The official router for Vue.js.
Vue.js(label: good first issue) The Progressive JavaScript Framework.
VuePress(label: good first issue) Minimalistic Vue-powered static site generator
webdriver.io(label: first-timers-only) Next-gen browser and mobile automation test framework for Node.js
Rawsec Cybersecurity Inventory(label: difficulty::easy) An inventory of tools and resources that aims to help people to find everything related to CyberSecurity.
Atrium(label: good first issue) Multiplatform assertion library for Kotlin
Hexagon(label: help-wanted) A microservices toolkit written in Kotlin
Non-Blocking SirixDB HTTP(S)-Server(label: good first issue) A non-blocking HTTP(S)-Server for SirixDB, a temporal, evolutionary NoSQL document store for XML and JSON.
OpenCalc(label: good first issue) A simple and beautiful calculator for Android.
Scribe-Android(label: good first issue) Android keyboards for language learners with translation, verb conjugation and more!
The Odin Project Curriculum(label: See Description) An open-source curriculum for learning full-stack web development. There are a few “Type: Good First Issue” labelled issues, but any content addition/deletion issues seem reasonably beginner friendly.
tldr-pages(label: help-wanted) Collaborative cheatsheets for console commands.
SuperDuperDB(label: good first issue) 🔮SuperDuperDB: Bring AI to your favourite database! Integrate, train and manage any AI models and APIs directly with your database and your data
Appwrite(label: good first issue) An End-to-end backend server for frontend and mobile developers. 🚀
CodeIgniter(label: good first issue) A lightweight, fast PHP framework, it is easy to install and perfect for learning MVC architecture.
Deployer(label: good-for-beginner) A deployment tool written in PHP with support for popular frameworks out of the box.
Drupal(label: n/a) Leading open-source CMS for ambitious digital experiences that reach your audience across multiple channels.
Flarum(label: Good-first-issue) Simple forum software for building great communities.
FreshRSS(label: good first issue) FreshRSS is a self-hosted RSS and Atom feed aggregator. It is lightweight, easy to work with, powerful, and customizable. Since 2012.
Laravel Newsletters(label: good first issue) A package that provides an easy way to integrate MailChimp with Laravel 5.
Matomo(label: help-wanted) Matomo is the leading Free/Libre open analytics platform.
MediaWiki(label: n/a) The free and open-source wiki software package that powers Wikipedia.
NextCloud Server(label: good first issue) Nextcloud server, a safe home for all your data.
PHP Censor(label: good-for-beginner) Open source self-hosted continuous integration server for PHP projects.
phpMyAdmin(label: newbie) Admin interface for MySQL written in PHP.
PrestaShop(label: good first issue) The open source ecommerce solution to start your online business and start selling online.
Symfony(label: good first issue) Symfony is a PHP framework for web applications and a set of reusable PHP components.
Rawsec Cybersecurity Inventory(label: difficulty::easy) An inventory of tools and resources that aims to help people to find everything related to CyberSecurity.
