A book that teaches JavaScript

JabRef is a reference management software that uses BibTeX and BibLaTeX as its native formats and is therefore typically used for LaTeX. What makes JabRef development special is that two developers will review each pull request to ensure high quality.

Fast, disk space efficient package manager

FreshRSS is a self-hosted RSS and Atom feed aggregator. It is lightweight, easy to work with, powerful, and customizable.

The NuGet Gallery. Powers the "NuGet.org" website, as well as other NuGet package galleries.

Community bounty board for RustChain ecosystem - earn RTC tokens for contributions

Open Standard for Metadata. A Single place to Discover, Collaborate and Get your data right.

A modern, AI-powered full-stack voice assistant built for 2026. Lisa combines real-time speech recognition, intelligent LLM responses, live web search, browser geolocation, cloud memory, and natural neural voice synthesis into a seamless conversational experience.

A fast line-by-line code for computing high-resolution infrared molecular spectra

Go bindings for Roc Toolkit (real-time audio streaming)

Internationalisation solution for React, Vue, Svelte etc. Integrate a Visual Editor for structured content.

Linux feed reader for GNOME/GTK

A safe home for all your data

A free, open source, community-focused unit testing tool for the .NET Framework.

C compiler for the CLI platform

A systems programming language focused on safety, speed, and concurrency.

The OpenTelemetry .NET Contrib project. OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Julia is a high-level, high-performance dynamic programming language for technical computing. http://www.julialang.org

A curated, community-driven list of the best tech, software engineering, and developer marketing newsletters. Stay up-to-date with top-tier insights across AI, DevOps, Frontend, and more.

The http://freeCodeCamp.com open source codebase and curriculum. Learn to code and help nonprofits.

An addiction tracker web app

A local-first Solana transaction policy firewall and tamper-evident receipt ledger for AI agents.

A Python framework for modular, self-contained skill management for machines.

Client libraries for Sentry, an error reporting and performance monitoring platform, for usage from .NET and popular application frameworks

Open-source observability for LLMs, based on OpenTelemetry

Interactive learning platform using Python and Javascript with AngularJS

TypeScript is a superset of JavaScript that compiles to clean JavaScript. It adds static typing and next-level ECMAScript features to JavaScript.

Static analysis for Django models (VS Code extension + Python CLI + MCP server for AI agents). Zero database, zero Django boot, zero credentials — just parse models.py. Translations, docs, small CLI fixes, and golden fixtures all welcome as first contributions.

Organizing the information that matters to you and your teams. The knowledge of your world.

Kubernetes and Docker monitoring CLI for real-time workload, health, and log visibility

Specification of OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

An open specification and runtime for representing, testing, and auditing the evidence, rules, exceptions, uncertainty, and escalation criteria behind AI-agent decisions.

A Q&A platform software for teams and enterprises to launch community forum, knowledge base, and help center at ease.

Execution-grounded semantic (Type-4) clone detection for JS/TS — finds functions that behave the same but are written differently, then runs them in a sandbox to prove which one is wrong.

The OWASP Cheat Sheet Series was created to provide a concise collection of high value information on specific application security topics.

A cross-platform UI framework for .NET

This repo is for the techtonica.org website for Techtonica, a nonprofit tech training program that helps women and non-binary adults with low incomes overcome barriers into tech careers.

Content curation tools for Kolibri Learning Platform (the offline app for universal education)

A collaborative online office suite based on LibreOffice technology

An extensible Lua-configured Unix shell

Header-Only C++ Library for Graph Representation and Algorithms

Your self-hosted live video streaming and chat server.

An open source, cloud-native programming language optimized for integration.

Browser extension and self-hosted FastAPI backend that tailor a resume and cover letter to a job posting using your own OpenAI, Claude or Gemini API key

A community-curated collection of simplified and example-driven man pages.

Kubernetes Operator for OpenTelemetry Collector. OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

A programming assignment submission system

KubeIntellect lets operators ask Kubernetes questions in plain English, gathers live evidence from cluster tools such as kubectl, Prometheus and Loki, and pauses for explicit human approval before destructive operations. It is a research system rather than a production-certified product: synthesized tools are validated and approval-gated, but currently execute in-process rather than in an isolated container. Python, FastAPI and LangGraph; AGPL-3.0.

Free and Open Source Reverse Engineering Platform powered by radare2

BuildCLI is a command-line interface (CLI) tool for managing and automating common tasks in Java project development.

Documentation for .NET

Discord bot that watches BookMyShow and DMs you the moment tickets open. Self-hosted with one command, no API keys.

Short, unique IDs that carry a prefix telling you what they belong to — user_a1b2c3, order_9f8e7d. Readable, secure, and typed — for TypeScript and JavaScript alike.

MvvmCross is the .NET MVVM framework for cross-platform solutions, including Xamarin.iOS, Xamarin.Android, Windows and Mac. http://mvvmcross.com

an open source layer that delivers resilience and manageability to object-storage based data lakes

A bulk file downloader for Windows, with real-Chrome extraction over CDP, aiohttp streaming, a WebView2 GUI and a headless CLI.

A lightweight, local-only Chrome extension that reduces common third-party website tracking by blocking known tracker requests, cleaning tracking links, and explaining tracking attempts.

Multi-platform 2D and 3D game engine

C++ implementation of OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Discord bot that securely links and verifies GitHub accounts with Discord accounts, with org/repo/team verification and automatic role sync.

An ORM for node.js supporting PostgresQL, MySQL, sqlite and MSSQL

minimal wireframing css-framework

A neo-brutalist React component library built with Tailwind CSS, featuring zero-gap layout logic, automated YIQ contrast calculation, and high structural stability.

scikit-learn models hyperparameters tuning, using evolutionary algorithms.

The next-generation project management platform

Claude Code agent coordination skill for multi-agent task orchestration

Manage localization of all ResX-Based resources in one central place

The OpenTelemetry Python Contrib project. OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Distributed, high-performance SQL database

A toolkit for .NET projects

Open source Slack-alternative in Golang and React

Storybook is a development environment for UI components. It allows you to browse/develop/test a component library based on React & React-Native.

Send files directly between devices over encrypted, serverless P2P WebRTC. No uploads, no signup.

A lightweight but powerful source code editor which runs on your desktop and is available for Windows, macOS and Linux.

Infisical is an open-source, E2EE tool to sync environment variables across your team and infrastructure.

API documentation for .NET

A private, in-browser AI summarizer for articles, videos, and PDFs. Runs entirely on-device via WebGPU or WebAssembly, or against your own local Ollama instance. No backend, no API keys, no cloud.

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.

Meshery enables collaborative design and operation of cloud and cloud native infrastructure. Meshery is an extensible, self-service engineering platform.

OpenID/Connect, OAuth2 and WS-Federation server based on IdentityServer4 or Duende IdentityServer with its admin UI

Build custom CRUD apps that talk to any API or database. All without HTML or CSS.

CLI-agnostic AI job-search automation - pipeline tracking, offer evaluation, CV generation, and zero-token job scanning

Bitwarden is the easiest and safest way to store all of your logins and passwords while conveniently keeping them synced between all of your devices. This repository houses all Bitwarden client applications except the Mobile application.

Ptera Software is a fast, easy-to-use, and open-source software package for analyzing flapping-wing flight.

Finds and mechanically fixes what the MCP 2026-07-28 spec revision breaks in your server. 21 rules, 5 autofixers, and a graded board of real servers.

🦀 An open source payments switch to make Payments fast, reliable, and affordable.

PowerShell for every system!

DevDisplay is the First Global Platform for Developers to Fulfill All Their Tech Needs. A paradise for developers, where they can Connect ▸ Collab ▸ Code ▸ Create ▸ Conquer — all in one place.

An open-source transport-layer data proxy providing zero-code-intrusion state checkpoints and instant kernel failovers for long-running AI agent workloads.

TripAi is a powerful AI-based travel planning web application that helps users effortlessly generate customised trip itineraries. By leveraging Meta’s Llama 3.8B Instruct model and integrating real-time data from Amadeus APIs, TripAi delivers intelligent and practical trip suggestions – including flights, hotels, and personalised activities.

PHP implementation of OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

The offline app for universal education

Fast and minimalist 3D viewer

A Python package for multivariate hypothesis testing

OpenTelemetry auto-instrumentation and instrumentation libraries for Java. OpenTelemetry is a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

A Vulnerable Web Application for DAST developers, Students and DAST consumers.

An open source plasma physics package in Python

The CRM we wished existed - pipeline ops, follow-up discipline, and SDR visibility without enterprise pricing. React + Express + PostgreSQL.

.NET Aspire is an opinionated, cloud ready stack for building observable, production ready, distributed applications in .NET

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

ASP.NET Core is a cross-platform .NET for building modern web applications on Windows, Mac, or Linux.

Zero-knowledge encrypted pastebin. Data is encrypted in the browser before it ever reaches the server.

Python implementation of OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

A simple markdown viewer built with Python, designed for desktop users to open `.md` files directly.

A minimalist PDF creation library for Python

The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic compilers with rich code analysis APIs.

Git Extensions is a standalone UI tool for managing git repositories. It also integrates with Windows Explorer and Microsoft Visual Studio (2015/2017/2019).

Open-source Python toolkit for water data, hydrology, and agricultural water management. Unifies 15 global water-data sources behind one schema, with Bulletin 17C flood frequency, baseflow separation, FAO-56 crop water requirements, and an AI methodology recommender. Issues are scoped with clear acceptance criteria and a first-issue to second-issue to area-owner contributor ladder.

An opensource identity and access management platform as an alternative to Auth0

Realtime collaborative markdown notes

Generation of diagram and flowchart from text in a similar manner as markdown

Java bindings for Roc Toolkit (real-time audio streaming)

Probably the most modern lightweight distributed farm of Vulnerable Applications built for handling wide range of vulnerabilities across tech stacks.

Context governance for agentic AI — tamper-evident audit trails for LLM context inputs

Img2Num is a cross-platform library that converts raster images such as PNG and JPEG into clean, layered SVG paths. It is designed for high performance with WebGPU acceleration, minimal dependencies, cross-platform support, and bindings for multiple programming languages.

Cross platform Native mobile apps with JavaScript

.NET nanoFramework is a free and open-source platform that enables the writing of C# code applications for constrained embedded devices like ARM Cortex-M0/M4/M7, ESP32, TI CC3220, NXP and other microcontrollers.

Fully local AI assistant that watches your screen (windows, clipboard, screenshots) so you can query your own activity history instead of re-explaining context to an LLM every time. Runs on Ollama + a local vision model, nothing leaves your machine.

Volatile is a high-performance, UCI-compatible C++ chess engine built from scratch, currently playing at a 2200-2400 Elo. We are looking for contributors of all skill levels to help us bridge the gap to top-tier engines. This project serves as a fantastic, beginner-friendly learning ground for modern C++ systems programming, clean architecture (SOLID principles), and game AI. Current high-priority tasks include integrating Efficiently Updatable Neural Networks (NNUE), implementing Monte-Carlo Tree Search (MCTS), optimizing time-management algorithms, and improving our testing and CI/CD infrastructure. Whether you are making your first open-source contribution or you are an expert eager to tackle complex optimization problems, your ideas are warmly welcomed here!

ClickHouse is a fast open-source OLAP database management system

The OpenTelemetry website and documentation. OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Open cloud security platform for AWS, Azure, GCP, Kubernetes, Github, M365 and more. Prowler performs security assessments and compliance checks with hundreds of built-in controls for security frameworks like CIS, NIST 800, NIST CSF, CISA, FedRAMP, PCI-DSS, GDPR, HIPAA, and more.

An open-source AI-powered learning platform with intelligent tutoring, adaptive assessments, and personalized study tools. Full-stack application with NestJS backend, React frontend, and Flutter mobile app.

Repo-native coding-agent loop harness for Claude, Codex, Copilot, and other CLI agents. Agents can edit; gates decide what lands.

Assembly programming game: program the 8086-like microprocessor of a robot in a grid-based multiplayer world

Free, open-source voice dictation and speech-to-text for Linux, macOS and Windows — hold a key, speak, release, and the text is typed into whatever window has focus. Runs on the CPU with faster-whisper; nothing leaves the machine by default. Also transcribes recordings and captures meetings with speaker labels. No cloud, no API key.

Stateful memory runtime for AI agents that enables persistent memory, context, and continuity across sessions.

A smart launcher for Mac. Powered by JavaScript.

AI-powered Moodle plugin for tutoring, quizzes, mind maps, RAG course materials and beginner-friendly open source contributions.

A list of 99 machine learning projects for anyone interested to learn from coding and building projects

Production-Grade Container Scheduling and Management

Official TypeScript SDK for the Kakunin AI Agent KYC platform — issues X.509 certificates to AI agents, verifies scopes, and enforces them via drop-in middleware.

Core formulae for the Homebrew package manager

A python framework accelerating Machine Learning based discovery in the medical field by encouraging code reuse.

A programming language for writing tests that go beyond simple unit testing

A faster Python type checker and language server written in Rust

An open-source, nonprofit activism network

The free and open source solution for automated video capture and distribution at scale.

Symfony is a PHP framework for web applications and a set of reusable PHP components. Symfony is used by thousands of web applications and most of the popular PHP projects.

open source, low-latency, high quality voice chat software primarily intended for use while gaming

A Python package to assess and improve fairness of machine learning models.

Open-source Windows maintenance CLI and TUI. Dry-run by default, Recycle Bin only, fully undoable.

Javascript database for traditional SQL queries. Smaller and faster alternative to sql.js

Kibana lets you visualize your Elasticsearch data and navigate the Elastic Stack so you can do anything from tracking query load to understanding the way requests flow through your apps.

A dependency manager for .NET with support for NuGet packages and Git repositories.

Collector for OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Open-source VCS layer for reviewing AI-agent code changes with semantic diffs and provenance.

Contrib repository for the OpenTelemetry Collector. OpenTelemetry provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Give your AI agent a real browser. MCP server + Chrome extension for task-level browser automation.

The Wikimedia Commons Android app allows users to upload pictures from their Android phone/tablet to Wikimedia Commons. Initially started by the Wikimedia Foundation, this app is now maintained by volunteers.

A search-engine for openly-licensed media, part of the WordPress project

Proof-of-Antiquity blockchain with hardware attestation - rewards vintage hardware miners (PowerPC G4/G5, POWER8) with RTC tokens

Open-source desktop Minecraft launcher for Windows and Linux with isolated instances, Modrinth, automatic Java, diagnostics, and safe backups.

Web based translation tool with tight version control integration.

A project designed to help you familiarize yourself with the open source contribution workflow on GitHub, as well as to help you learn the basics of programming in different languages.

A full-stack AI agent platform built with Python and TypeScript.

A fair and efficient, interactive, general-purpose group-decision app

High Performance Data Backbone for Robotics and Industrial IoT

A RESTful API server for vegeta, a load testing tool written in Go.

Design system for Kolibri Learning Platform (the offline app for universal education) and related projects

NLog - Flexible and high performance logging framework for the .NET platforms

Deterministic orchestrator for 30+ CLI AI coding agents (Claude Code, Codex, Aider, Cursor, Goose, etc.). Git worktree isolation, HMAC audit trail, MCP server mode.

Governed shared memory for AI agent fleets — multi-agent, multi-tenant, MCP-native. Trust tiers, keystone policies, audit trails, knowledge graph, self-improving retrieval. Apache 2.0.

Core functionality needed to create .NET projects, that is shared between Visual Studio and the .NET CLI

Windows Forms also provides one of the most productive ways to create desktop applications based on the visual designer provided in Visual Studio. It enables drag-and-drop of visual controls and other similar functionality that make it easy to build desktop applications.

UI for Apache Kafka is a free, open-source web UI to monitor and manage Apache Kafka clusters

A machine learning system that recommends optimal crops based on soil and weather metrics, featuring local SHAP explainability and interactive market profitability risk profiling.

A framework for building native apps with React.

OpenVINO™ is an open-source toolkit for optimizing and deploying AI inference.

An interface-centric real-time communication engine to connect Things at the edge of the network and develop distribute embedded applications.

This is perhaps one of the easiest ways to get introduced to open source

Python-based continuous integration testing framework.

A fast and efficient JVM that delivers power and performance when you need it most.

A declarative, efficient, and flexible JavaScript library for building user interfaces.

Beginner-friendly open-source lab for practicing Git, GitHub, issues, pull requests, CI, and maintainer workflows.

A Loyalty Card & Ticket Manager for Android

Consumable Data Structures and Algorithms library in JavaScript

A role-aware, permission-enforced benchmark for evaluating AI agents that operate HPC systems — SLURM job control, telemetry inspection, RBAC, documentation and facility tasks. Runs are trace-based and reproducible against deterministic environment snapshots, and a permission violation hard-fails the task rather than being scored as a near miss. Some environments are grounded in telemetry from a real production supercomputer.

Open-source alert management and workflow automation platform.

Open source security software for Bootstrapping and Maintaining Trust

Keploy is a functional testing toolkit for developers. It generates E2E tests for APIs (KTests) along with mocks or stubs(KMocks) by recording real API calls. KTests can be imported as mocks for consumers and vice-versa.

chroot, mount --bind, and binfmt_misc without privilege/setup for Linux

A .NET port of the popular Java/Scala Akka Toolkit.

Open-source CLI that turns private git history into an NDA-safe skill credential. Metadata only, the code never leaves the machine. Many starter issues are one-line additions to a JSON signature database, no code required.

An always-on organic growth loop for your website, as a free Claude plugin. It watches search and AI-answer performance, proposes work with the reasoning attached, applies approved changes to WordPress, verifies they landed, and learns from the outcome. Every write is gated on a recorded human approval.

JavaScript implementation of OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

Open-source repository containing structured Python and AI knowledge for the Py.AI website.

Find original and updated publication dates of web pages using common patterns, heuristics and robust extraction

.NET is a cross-platform runtime and libraries for cloud, IoT, and desktop apps.

Implementations of SIMD instruction sets for systems which do not natively support them.

ToolJet is an open-source low-code platform for building and deploying internal tools with minimal engineering efforts 🚀

PyTorch is an open source machine learning library based, used for applications such as computer vision and NLP.

The Electron framework lets you write cross-platform desktop applications using JavaScript, HTML and CSS.

icalendar parser library for Python

Terminal-first, self-hosted AI gateway with provider-free prompt enhancement, a credential-free local demo, and nine governed MCP tools for Codex and other hosts.

Find and redact secrets that leak into AI coding agent histories, such as Claude Code sessions.

Orchestration and automation platform to execute millions of scheduled and event-driven workflows declaratively in code and from the UI

cpersist is a C++ data persistence and serialization library.

.NET implementation of OpenTelemetry, a working name of a combined OpenCensus and OpenTracing project. It provides a single set of APIs, libraries, agents, and collector services to capture distributed traces and metrics from your application. You can analyze them using Prometheus, Jaeger, and other observability tools.

This repo contains the curriculum of Techtonica, a tech training program for women and non-binary adults with low incomes.

The compiler for writing next generation JavaScript.

Local-first CLI that classifies CI failure logs by root cause and suggests a fix, running fully offline so no data leaves your machine.

The parallel browser engine project

Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse, Replace & Version everything just like code. Offline, Truly Git Native, No Lock-in.

Windows Hello style facial authentication for Linux

A web-based tool to visualize popular sorting algorithms with animations, built using React and Material-UI.

The Guake drop-down terminal

A repository containing creative projects built using the turtle library in python