Help out your favorite open source projects and become a better developer while doing it.

OsmAnd

Nix, the purely functional package manager

The JavaScript and API powered WordPress.com

Scalable datastore for metrics, events, and real-time analytics

A safe, concurrent, practical language.

Optional static typing for Python 2 and 3 (PEP484)

Dolibarr ERP CRM is a modern software package to manage your company or foundation activity (contacts, suppliers, invoices, orders, stocks, agenda, ...).It's opensource software (wrote with PHP language) designed for small and medium companies, foundation

Distributed SQL query engine for big data

Free (libre) font editor for Windows, Mac OS X and GNU+Linux

RIOT - The friendly OS for IoT

Terraform is a tool for building, changing, and combining infrastructure safely and efficiently.

The Python programming language

Caffe: a fast open framework for deep learning.

The https://freeCodeCamp.org open source codebase and curriculum. Learn to code and help nonprofits.

Theia is a cloud & desktop IDE framework implemented in TypeScript.

Bitcoin Core integration/staging tree

Entity Framework Core is a lightweight and extensible version of the popular Entity Framework data access technology

A place to report bugs on websites.

Gitea: Git with a cup of tea

Home of the Joomla! Content Management System

BOSH release and development workspace for Concourse

Official upstream development repository for Cabal and cabal-install

openFrameworks is a community-developed cross platform toolkit for creative coding in C++.

A PSP emulator for Android, Windows, Mac and Linux, written in C++. Want to contribute? Join us in #ppsspp on freenode (IRC) or just send pull requests / issues. For discussion use the forums on ppsspp.org.

Magic Another Game Engine

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

The Crystal Programming Language

Visual Studio Code

Semantic is a UI component framework based around useful principles from natural language.

☁️ Nextcloud server, a safe home for all your data

a package manager for javascript

IPFS implementation in go

Vim-fork focused on extensibility and usability

A virtual machine for executing programs written in Hack.

The official Vim repository

Node.js JavaScript runtime :sparkles::turtle::rocket::sparkles:

A bunch of lints to catch common mistakes and improve your Rust code

A bunch of lints to catch common mistakes and improve your Rust code

A bunch of lints to catch common mistakes and improve your Rust code

Build highly concurrent, distributed, and resilient message-driven applications on the JVM

Spring Framework

Free and Open Source Web front-end resource CDN maintained by @PeterDaveHello

Ballerina is a compiled, transactional, statically and strongly typed programming language with textual and graphical syntaxes.

Sentry is a cross-platform crash reporting and aggregation platform.

Google core libraries for Java

The host/runtime that powers Azure Functions

Spring Security

vis.js is a dynamic, browser-based visualization library