Open-source alternatives to Reactos

Nim is a statically typed, compiled systems programming language designed for high performance and cross-platform development. It translates high-level source code into C, C++, or JavaScript, allowing developers to produce efficient native binaries or web-compatible scripts from a single codebase. The language emphasizes a clean, indentation-based syntax that simplifies code hierarchy while maintaining the power of a full-featured systems language. What distinguishes Nim is its robust metaprogramming framework, which allows developers to inspect, modify, and generate code structures during th

This project is an educational framework and toolkit designed for developing and testing operating system kernels. It provides a structured environment for implementing fundamental system primitives, including virtual memory management, preemptive process scheduling, and filesystem organization, using Rust and C. The framework is specifically oriented toward RISC-V and x86 architectures, serving as a laboratory for learning how to build core system software from the ground up. The project distinguishes itself by supporting both bare-metal deployment and hardware emulation, allowing developers

This project provides a Linux kernel development environment and a system emulation suite for building and debugging kernel modules and baremetal assembly across multiple hardware architectures. It functions as a comprehensive sandbox and framework for low-level system development, utilizing QEMU to simulate hardware environments without the need for physical devices. The environment integrates cross-compilation toolchains using Buildroot and crosstool-NG to target x86_64, ARMv7, and ARMv8 platforms from a single host. It features a specialized kernel debugging framework that leverages GDB an

The Linux kernel is a monolithic operating system core that manages hardware resources, memory, and process scheduling across diverse computing architectures. It provides a standardized, POSIX-compliant environment for application execution while maintaining a modular driver framework that allows for the dynamic loading and removal of hardware interfaces. The project is distinguished by its high-performance concurrency toolkit, which utilizes lockless synchronization primitives and read-copy-update mechanisms to manage shared data access in multi-core environments. It incorporates a comprehen

edk2 is a development project for creating system firmware that complies with the UEFI specification. It provides the necessary infrastructure to initialize hardware platforms and boot operating systems across multiple CPU architectures. The project utilizes a modular firmware architecture that decouples high-level management protocols from physical transport layers. It implements critical security features, including a measured boot chain, cryptographic primitives for image authentication, and support for Trusted Platform Module hardware and software implementations. Its capability surface

This repository contains the complete source code for a Unix-like operating system, including the monolithic kernel and base system utilities. It provides a BSD-derived system core and a full build toolchain required to compile a functional operating system for servers, desktops, or embedded devices. The system features a Linux binary compatibility layer that enables the execution and emulation of Linux binaries on a non-Linux platform. It also includes a modular kernel configuration process to tailor hardware support and system features during compilation. The project covers broad system ca

fnnas is a Debian-based network attached storage operating system and deployment framework designed to transform x86 and Arm64 hardware into private storage servers. It provides a custom operating system image builder and a kernel compilation tool for building and packaging specific kernels and device tree blobs for various hardware platforms. The project includes a hardware-specific deployer that maps device models to required bootloaders and kernel tags. It features an eMMC backup and recovery tool to save factory system images from internal storage and restore them to revert system changes

Crystal is a statically typed, compiled programming language designed for high performance and memory safety. It leverages an LLVM-based compiler to translate source code into optimized machine-executable binaries, while its type-inference-based static analysis enforces strict safety rules during the build process. The language distinguishes itself through a fiber-based concurrent runtime that manages lightweight execution units for asynchronous input and output without blocking the main process. It also features a powerful compile-time macro system that allows for the inspection and transfor

OpenWrt is a modular Linux distribution designed for resource-constrained networking hardware. It functions as a comprehensive network routing platform, providing a complete build environment that allows users to generate custom firmware images for a wide variety of embedded processor architectures. By utilizing a standardized cross-compilation toolchain and a package-based ecosystem, it enables the creation of tailored operating systems for specific hardware deployments. The project distinguishes itself through a hardware abstraction layer that normalizes interactions across diverse chipsets

OpenClash is a network traffic controller designed for embedded router hardware. It functions as a kernel-level traffic management solution that intercepts network packets to enforce user-defined routing policies and connectivity rules across home or office network environments. The project distinguishes itself through a comprehensive build and deployment pipeline tailored for diverse firmware architectures. It provides a cross-compilation environment that transforms source code into hardware-specific installation files, while also offering a package management system to handle the retrieval

This project is a Windows security removal tool designed to permanently disable and delete antivirus services and security monitoring components from the operating system. It functions as a system performance optimizer and policy manager to remove security mitigations and clear policy files that restrict application execution. The tool includes a Windows ISO customizer that embeds configuration files and unattended installation scripts into bootable images. This allows security features to be bypassed and services to be disabled before the initial system boot. The software covers broad capab

Talos is a minimal, immutable Linux distribution designed specifically for deploying and managing Kubernetes clusters. It functions as an API-driven infrastructure manager that replaces traditional shell access with a declarative gRPC interface to control operating system state and configuration. The system is distinguished by its use of a read-only root filesystem and a security-hardened kernel, which removes standard GNU utilities to reduce the attack surface. It ensures environment consistency by distributing the operating system as versioned, signed images and utilizes TPM-backed verified

Box64 is a cross-architecture runtime and user-mode emulation layer that allows Linux and Windows software to run on non-native hardware. It functions as an x86-64 instruction emulator and binary translator, executing 64-bit binaries on different CPU architectures by translating machine code into native instructions. The project utilizes dynamic recompilation to accelerate execution and maps guest system calls to native host libraries to increase speed and hardware compatibility. It can simulate a 32-bit execution environment to support legacy software and integrates with the operating system

The Rust Programming Language Book is the official technical guide and educational resource for the Rust language. It provides a comprehensive walkthrough of the language's design, focusing on its core identity as a systems programming language that enforces memory safety and high-performance execution without the need for a garbage collector. The project is distinguished by its focus on ownership, borrowing, and lifetime tracking, which allow the compiler to verify memory safety and thread safety at compile time. It covers the language's unique approach to zero-cost abstractions, including t

Waydroid is a containerized mobile runtime that executes a full Android operating system directly on Linux desktop environments. By utilizing Linux kernel namespaces, it isolates the mobile environment while sharing the host kernel to provide native-like performance and hardware access for mobile applications. The project distinguishes itself through deep integration with the host system, bridging mobile display buffers to native desktop windows and translating host input events into mobile gestures. It enables multi-window management, allowing mobile applications to run alongside native desk

This project is a bare-metal operating system developed for ARM64 architecture. It serves as a low-level implementation of kernel engineering, focusing on the fundamental construction of an OS from the hardware level up. The system is distinguished by its comprehensive approach to ARM64 processor control, featuring a red-black tree task scheduler and a hierarchical page table system for virtual memory management. It implements a sophisticated privilege model that handles transitions between kernel and user modes, ensuring process isolation through address space splitting and exception level m

ESPHome is a framework for creating and managing custom firmware for microcontrollers, specifically targeting ESP32 and ESP8266 architectures. It replaces the need for writing complex embedded C++ code by allowing users to define hardware behavior, pin configurations, and automation logic through simple, declarative text files. The system automatically compiles these configurations into optimized binary images, providing a streamlined path from design to deployment. The project distinguishes itself through a modular, component-based architecture that emphasizes local-first control, ensuring t

ModernCppStarter is a pre-configured project boilerplate and bootstrapping environment for C++ libraries and executables. It provides a standardized set of CMake build configurations and templates to automate the initialization of new projects. The project integrates a comprehensive static analysis suite and documentation automation. It includes systems for enforcing code quality through sanitizers and analyzers, as well as a pipeline for generating and deploying technical documentation during project releases. The template covers broader development infrastructure, including dependency mana

This project is an open source Linux GPU kernel driver implemented as a loadable kernel module. It functions as a GPU firmware loader, providing the low-level driver services necessary to enable direct communication between the operating system and graphics processing units. The driver utilizes a dual-module architecture that separates GPL-licensed kernel code from proprietary firmware blobs. This system extracts and links signed binary firmware images into the kernel modules at driver load time. The project provides driver support for Turing-architecture GPUs and all subsequent newer hardwa

c3c is the compiler for the C3 programming language, transforming source code into executable binaries, static libraries, or dynamic libraries using an LLVM backend. It implements a system based on result-based error handling, scoped memory pooling, and a semantic macro system. The compiler provides first-class support for hardware-backed SIMD vectors that map directly to processor instructions and enables runtime polymorphism through interface-based dynamic dispatch. The project covers a broad set of low-level capabilities, including manual and pooled memory management, inline assembly inte

This project is a curated collection of guidelines and technical resources designed to improve C++ code safety, maintainability, and performance. It provides a comprehensive set of coding standards and best practices for establishing consistent naming, formatting, and structural patterns across C++ codebases. The guide offers specific technical advice on performance optimization, including methods for minimizing object copying, optimizing memory allocation, and reducing compilation cycles. It also provides a directory of tooling recommendations for implementing static analysis, fuzz testing,

umu-launcher is a suite of tools designed to launch Windows game binaries on Linux systems. It serves as a runtime orchestrator and compatibility layer launcher that enables cross-platform software execution. The project manages game compatibility through a fix manager that retrieves and applies specific patches and configurations based on unique store identifiers. It also functions as a data isolation tool, allowing for the specification of custom directory paths to keep game configurations and save data separate from the host system. The system automates the deployment of runtime environme

Bottles is a Wine compatibility manager and prefix manager that provides a graphical interface for running Windows applications on Linux. It functions as a Windows application sandbox and dependency manager, organizing isolated environments to prevent dependency conflicts and protect the host operating system. The project acts as a Wine runner orchestrator, allowing users to download, install, and switch between different compatibility layers and graphics renderers. It distinguishes itself by using community-driven scripts for automated software installation and dependency management, alongsi

Proton GE Custom is a compatibility layer designed to execute Windows games on Linux by translating binary instructions and API calls. It focuses on improving game stability and performance through a Wine-based translation system. The project utilizes custom patches and per-game configuration overrides to resolve specific application crashes and glitches. It implements specialized media foundation patching to ensure stable playback of proprietary cinematic formats and adds support for High Dynamic Range output. The software covers a range of gaming optimizations, including raw input latency

DXVK is a graphics compatibility layer that enables Windows-based applications to run on non-Windows operating systems by translating legacy Direct3D instructions into the modern Vulkan API. It functions as a translation library that maps high-level rendering commands to low-level hardware-accelerated primitives, allowing for high-fidelity graphics output across different hardware environments. The project distinguishes itself through a suite of performance optimization strategies designed to maintain frame consistency and reduce latency. By utilizing background shader compilation and multith

photoshopCClinux is an automated software deployer and Linux compatibility wrapper designed to install and configure Adobe Photoshop CC on GNU/Linux systems. It functions as a specialized installer that utilizes the Wine compatibility layer to execute Windows-based imaging software. The project automates the setup of the necessary Wine environment, including the configuration of environment variables and prefix-isolated environments. This process ensures that the software and its registry settings remain separate from other Windows applications. The toolset covers the automated deployment of

Yabridge is a compatibility bridge that allows Windows audio plugins to run within Linux digital audio workstations. It utilizes a Wine-based wrapper to translate audio processing and plugin calls from Windows plugins to Linux hosts, supporting both VST2 and VST3 standards. The system manages the execution of both 32-bit and 64-bit Windows plugins on Linux. It includes specialized mechanisms to handle window scaling, input focus, and the transfer of data through cross-environment drag-and-drop between native Linux applications and Windows plugins. The project provides tools for environment i