Open-source alternatives to Darling

LoadLibrary is a binary instrumentation framework that loads and executes Windows PE/COFF DLLs natively within Linux processes. It provides a cross-platform binary execution layer that maps Windows portable executable files into Linux memory, resolving imports and relocations so that exported functions can be called as if they were native Linux library routines. The framework enables runtime interception and modification of Windows DLL function behavior, including redirecting API calls to Linux-native implementations through a binary patching hook engine. It includes a code coverage auditor t

ZLUDA is a middleware and translation engine designed to enable the execution of unmodified proprietary compute binaries on non-native graphics hardware. It functions as a compatibility layer that bridges vendor-specific compute interfaces with open standards, allowing software originally restricted to a single hardware ecosystem to operate on alternative graphics processing units. The project achieves this through a combination of dynamic library interception and runtime instruction translation. By replacing standard system libraries and mapping proprietary compute calls to open standards, t

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

This is a collection of academic programming projects that accompany an operating systems textbook, designed to teach core OS concepts through hands-on implementation. The projects span the major subsystems of an operating system, including process scheduling, memory management, file systems, and concurrency, with students building components from scratch in a simulated environment. The projects are structured to cover the full range of OS internals, from low-level kernel development to user-space system programming. Students implement lottery-based CPU schedulers, dynamic heap memory allocat

This project is a secure container runtime that provides strong isolation for application workloads by implementing a userspace kernel. By intercepting system calls and executing them within a memory-safe, restricted environment, it minimizes the attack surface exposed to the host kernel. It functions as a drop-in engine for standard container orchestration platforms, ensuring compatibility with industry-standard runtime specifications while maintaining a hardened execution boundary. The runtime distinguishes itself through its ability to virtualize core system resources, including an indepen

Proton is a compatibility layer designed to enable the execution of Windows-based software on non-Windows operating systems. It functions as a controlled runtime environment that maps proprietary system calls to native kernel functions and translates graphics API commands into open-standard compute shaders. This allows applications to run without requiring modifications to their original source code. The project distinguishes itself through a robust toolchain for reproducible builds, which utilizes containerized isolation to ensure consistent binary outputs across different development enviro

Termux is a mobile terminal emulator and Linux environment runtime that provides a full command-line interface directly on Android devices. It functions as a comprehensive platform for executing native binaries and scripts, featuring an integrated package management system that allows users to download, install, and manage open-source software repositories to extend device functionality. The project distinguishes itself by acting as an embedded execution library, enabling third-party applications to integrate terminal and package management capabilities into their own interfaces without requi

Lively is a desktop wallpaper engine for Windows that renders videos, web pages, and interactive shaders as dynamic, animated backgrounds. It functions by creating a transparent window layer behind desktop icons, utilizing native system handles to integrate content directly into the workspace. The application provides tools for system personalization, including the ability to adjust taskbar transparency and application themes to modify the visual style of the operating system. It also includes a command-line interface that allows for the automation of background playback and system configurat

This project is an OS-level process sandbox and cross-platform security wrapper for Linux and macOS. It is designed to isolate arbitrary processes from the host machine by restricting filesystem and network access without the use of full containerization. The system functions as a system-call interceptor and access controller, blocking unauthorized operating system calls based on predefined security policies. It employs allowlists and denylists to manage resource requests and monitors for security violations in real time. Capability areas include filesystem access management using glob-patte

rr is a deterministic record and replay framework and reverse debugger for Linux processes. It provides a deterministic execution environment that captures program execution, allowing bugs and crashes to be reproduced exactly through replay. The tool enables reverse program execution, allowing a developer to move the program counter backward through recorded history to trace a bug from its effect back to its source. It utilizes a recording mechanism that ensures a process run can be replayed with identical memory and register states. The framework covers low-level software analysis and nativ

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

WinApps is a utility designed to run Windows applications within a virtualized environment while integrating them directly into a Linux desktop. By utilizing remote desktop protocols to stream graphical interfaces, the software allows virtualized programs to appear and behave as if they were installed natively on the host operating system. The project distinguishes itself by automating the discovery and configuration of these applications. It scans the guest registry to identify installed software and automatically generates desktop entries and shortcuts, enabling users to launch Windows prog

Magpie is a desktop utility designed to enhance the visual fidelity and resolution of running applications through real-time graphics post-processing. It functions by intercepting the desktop frame buffer and applying spatial reconstruction and interpolation algorithms to upscale visual content during active playback. The system distinguishes itself by integrating a programmable graphics pipeline that allows for the injection of custom shaders directly into the display stream. Beyond visual enhancement, it provides an automation interface that enables programmatic control over application beh

Asterinas is a memory-safe operating system kernel designed to prevent data races and memory corruption. It functions as a Linux-ABI compatible kernel, enabling the execution of existing Linux binaries and container workloads while providing a declarative operating system distribution model. The project distinguishes itself by acting as a virtual machine container host and a confidential computing guest OS, allowing it to run within hardware-isolated Trusted Execution Environments such as Intel TDX. It implements a minimal trusted computing base by isolating unsafe low-level operations and se

Wine is a compatibility layer that enables Windows binaries and applications to run on Unix-like operating systems. It functions as a cross-platform binary loader and Windows API implementation that translates system calls into functional equivalents on non-Windows platforms. The project provides tools for both the execution of existing binaries and the porting of Windows source code into native executables for Unix or macOS. This includes the ability to launch legacy software, such as older DOS and early Windows programs, on modern hardware. The system operates by mapping Windows system cal

Blink is a JIT-based instruction emulator and x86-64 Linux emulator designed to run Linux binaries and ELF files across different host operating systems and architectures. It functions as a binary execution sandbox and system call simulator, providing a controlled environment for running programs. The project distinguishes itself with a terminal user interface for monitoring execution, managing breakpoints, and visualizing JIT compilation paths. It supports self-modifying code through a cache-invalidating memory model and provides execution environment isolation using restricted directory ove

The Android NDK samples provide a comprehensive collection of code examples demonstrating how to integrate C and C++ native code into Android applications. This repository serves as a practical guide for developers utilizing the Android Native Development Kit to implement performance-critical application components that require direct hardware access and low-level system interaction. The project highlights the use of the Java Native Interface to bridge managed code with native modules, enabling cross-language function calls and efficient data exchange. It demonstrates how to manage native act

Windows Forms is a .NET framework for building graphical user interfaces for Windows operating systems using managed code and native controls. It functions as an event-driven UI library that provides a set of visual controls and event handlers for creating interactive desktop applications. The framework includes a visual UI designer that allows for the arrangement of interface elements on a canvas via a drag-and-drop layout system. It also serves as a Windows API wrapper, providing a compatibility layer to access system-level libraries such as User32 and GDI+. Additional capabilities include

Piskel is a web-based graphics tool and pixel art editor designed for creating static sprites and frame-by-frame animations. It functions as an animated sprite creator that produces single frames and sprite sheets with adjustable scaling and layout. The project provides a grid-based interface for producing digital art and game assets. It supports both the creation of animated sequences for game characters and the design of static images tailored for game engines. The tool includes capabilities for layer-based composition and frame-based animation sequencing. It also offers a standalone deskt

This project is a cross-platform development framework that enables the execution of React Native applications as native desktop software. By utilizing the Qt toolkit, it maps mobile-oriented interface components to native desktop widgets, allowing developers to deploy a single codebase across Linux, macOS, and Windows. The framework functions as a bridge between JavaScript-based application logic and native system interfaces. It includes a native module bridge that exposes system-level hardware and platform capabilities to the JavaScript runtime, facilitating the integration of custom C++ or

SerenityOS is a complete, self-hosted desktop operating system built from the kernel up. It features a monolithic kernel architecture that manages system services, hardware drivers, and networking within a single address space. The system provides a full computing environment, including a proprietary windowing system and a suite of native desktop applications, all while maintaining a POSIX-compliant interface for standard system programming. The project is distinguished by its integrated development workflow, which relies on a cross-compilation build pipeline to generate system images from ho

This project is a cross-platform development framework and managed runtime environment designed for building high-performance applications. It provides a comprehensive toolkit for constructing web services, cloud-native microservices, and desktop applications, utilizing a unified runtime that handles memory management and execution across diverse operating systems. The framework distinguishes itself through a native ahead-of-time compilation toolchain that transforms source code into optimized, self-contained machine code binaries. This capability enables fast startup times and reduced memory

Handy is a local speech-to-text automation tool designed to convert spoken audio into text and inject it directly into active desktop applications. By running machine learning models entirely on the host hardware, it provides a private, offline-first environment for dictation and command execution. The system functions as a background service that manages microphone input, transcription state, and text output, enabling hands-free typing across various software environments. The project distinguishes itself through a modular pipeline that integrates local language models for post-transcription

jemalloc is a general purpose C memory allocator designed as a replacement for the standard library malloc and free functions. It is a multi-threaded allocation library that emphasizes fragmentation avoidance and scalable concurrency for high-performance applications. The project reduces lock contention by using multiple independent memory arenas and thread-local cache layers. It minimizes latency by offloading the reclamation of unused memory pages to asynchronous background threads and utilizes huge page metadata storage to reduce translation lookaside buffer misses. The system includes a

This project is an instructional repository and learning resource providing a comprehensive collection of study notes, programming guides, and runnable source code examples. It serves as a guide for Java SE and Java web development, featuring a library of code samples that demonstrate common algorithms and technical implementations. The repository focuses on language core and runtime analysis, with detailed tutorials on multithreading and concurrency. It provides practical implementations of software architecture and design patterns, such as the singleton and strategy patterns, as well as exp

JavaFamily is a curated set of learning paths and reference guides for backend engineering, distributed systems, and virtual machine internals. It provides a structured curriculum covering the Java language, operating system concepts, and network protocols. The project features detailed study guides for the Java virtual machine architecture, including memory management and garbage collection. It also includes a comprehensive reference for distributed systems, covering microservices, remote procedure call frameworks, and scalable system design. The collection covers a broad range of technical

FrankenPHP is a Go-based PHP runtime and application server that integrates a web server and PHP interpreter to host applications without requiring a separate process manager. It functions as a worker mode server that keeps applications in memory across requests to eliminate bootstrap overhead and a static binary bundler that packages applications and the server into a single self-contained executable. The project distinguishes itself by allowing the embedding of a PHP runtime directly into Go programs and enabling the development of PHP extensions using the Go language. It also includes a bu