Browse free open source C++ Operating Systems and projects below. Use the toggles on the left to filter open source C++ Operating Systems by OS, license, language, programming language, and project status.

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  • 1
    android-x86

    android-x86

    A project to bring Android to the x86 platform

    This is a project to port Android open source project to x86 platform, formerly known as "patch hosting for android x86 support". http://www.android-x86.org/
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    4.3 out of 5 stars 63 Reviews
    Downloads: 37,209 This Week
    Last Update:
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  • 2
    CachyOS

    CachyOS

    Blazingly Fast & Customizable Linux distribution

    CachyOS - Arch Linux Based Distribution With Heavy Optimizations & Multi-Architectures For Ultimate Desktop Experience Filesystems: - btrfs - zfs - ext4 - xfs - f2fs Our installer will auto detect which micro architecture your machine got, if x86-64-v3 or x86-64-v4 is detected it will automatically use the optimized packages, which is around a 10 % performance improvement. Desktop Environments: - KDE - CuteFish - i3 - Gnome - Openbox - Wayfire - Xfce - LXQT - bspwm All packages are compiled with Full LTO and other optimization flags. Depending on the march your cpu have it is compiled against x86-64, x86-64-v3 or x86-64-v4. For the Desktop Environment we provide basic theming. In CachyOS-Hello can be also security related packages enabled, like: DNScrypt-proxy Firejail apparmor Security and Performance! https://discord.gg/qJqj94uFwE https://t.me/+zCzPX4cAFjk1MTY
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    4.5 out of 5 stars 10 Reviews
    Downloads: 4,556 This Week
    Last Update:
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  • 3
    Arrow OS

    Arrow OS

    It is an AOSP based project with an aim of keeping things clean!

    ArrowOS is an AOSP based open source project started with the aim of keeping things simple, clean and neat, both for the Android system and users. We understand the pain of unnecessary and sometimes rarely used mods/features being shipped with custom roms nowadays which may end up causing battery drains and/or memory leaks. This is being strictly avoided on our side keeping everything to a bare minimum, delivering the stable performance all the time without destroying the AOSP interface. With users getting more used to tweaks and features, we added just the right stuff that will be actually USEFUL at the end of the day.
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    4.6 out of 5 stars 25 Reviews
    Downloads: 965 This Week
    Last Update:
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  • 4
    Lingmo OS
    Lingmo GNU/Linux (Lingmo OS) is a desktop based Linux operating system developed based on the open-source Debian kernel and adapted to the amd64 architecture. It has a beautiful desktop environment, software that is compatible with the desktop environment, and a unified UI style. The goal of Lingmo GNU/Linux is to provide users with a luxurious and practical desktop environment as well as a smooth experience on low performance hardware.
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    5.0 out of 5 stars 1 Review
    Downloads: 2,429 This Week
    Last Update:
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  • 5
    Syllable Desktop is a complete operating system that is easy to use, powerful, lightweight and extraordinarily fast and responsive. It has its own kernel, filesystem, GUI and applications. Syllable Server is a matching small and efficient Linux server.
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    4.3 out of 5 stars 11 Reviews
    Downloads: 492 This Week
    Last Update:
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  • 6
    Nitrux

    Nitrux

    A Linux system for modern computers on an immutable foundation.

    A Linux system for modern computers on an immutable foundation. Powered by OpenRC, MauiKit, NX AppHub, and Hyprland.
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    4.6 out of 5 stars 5 Reviews
    Downloads: 369 This Week
    Last Update:
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  • 7
    SerenityOS

    SerenityOS

    The Serenity Operating System

    SerenityOS is an open source Unix-like operating system project with its own custom kernel, graphical user interface, system libraries, and userland tools. It combines a nostalgic “90s UI aesthetic” with modern system capabilities: a preemptive, multi-threaded kernel, own browsers, network stack, file systems, IPC, security features, and a suite of graphical / developer applications. The project is both a hobbyist OS and a polished engineering sandbox.
    Downloads: 30 This Week
    Last Update:
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  • 8

    berryboot

    Berryboot -- Boot menu / OS installer for ARM devices

    Berryboot is a simple operating system installer and boot selection screen for ARM devices such as the Raspberry Pi and Cubieboard. It allows you to put multiple Linux distribution on a single SD card.
    4.3 out of 5 stars 13 Reviews
    Downloads: 175 This Week
    Last Update:
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  • 9
    GXDE OS

    GXDE OS

    Gorgeous eXtended Deepin Environment

    GXDE is a desktop environment which is based on DDE15 (Deepin Desktop Environment version 15). You can run the classic desktop on newer Debian-based system than deepin 15.11 If you want to download the daily build image, you can visit https://sourceforge.net/projects/gxde-os/ Discord: https://discord.gg/t5Uf2xYpvA
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    5.0 out of 5 stars 1 Review
    Downloads: 270 This Week
    Last Update:
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  • 10
    Infinity Linux

    Infinity Linux

    A lightweight Arch Linux based distribution based on Ezarcher

    A lightweight Arch Linux-based distribution built for performance, speed, and control.
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    5.0 out of 5 stars 1 Review
    Downloads: 257 This Week
    Last Update:
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  • 11
    hhuOS

    hhuOS

    hhuOS - A small operating system

    hhuOS is an educational operating system project developed by students at Heinrich Heine University (HHU) in Düsseldorf, Germany. It is built from scratch in C and Assembly and intended as a teaching tool to help students grasp the foundations of kernel development, memory management, system calls, and multitasking. The project focuses on clarity, modularity, and hands-on experimentation with real OS components, making it suitable for OS development courses or personal exploration.
    Downloads: 17 This Week
    Last Update:
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  • 12
    RebornOS

    RebornOS

    Made For You - Made With You

    RebornOS is an Arch Linux based distribution whose goal is to make Arch Linux more approachable to beginners. We stick close to Arch Linux, offer choices without much bloat, and we provide quite a bit more support and handholding than typical distributions so that beginners don't feel overwhelmed.
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    4.0 out of 5 stars 4 Reviews
    Downloads: 168 This Week
    Last Update:
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  • 13
    5.0 out of 5 stars 4 Reviews
    Downloads: 83 This Week
    Last Update:
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  • 14
    NebiOS Alternative Mirror (Official)

    NebiOS Alternative Mirror (Official)

    A unique Ubuntu-based Linux OS with its own desktop and ecosystem.

    NebiOS is an Ubuntu LTS-based Linux distribution with a custom desktop environment (NebiDE), built by one person. It combines a unique visual identity (Flat-Skeuomorphism), a widget-first desktop, and its own app format (.napp) into a cohesive platform — not just another reskin. Official mirror — use if the main site has download issues. Main site: https://nebios.org 📌 This mirror page is updated less frequently than the main site. For the latest information, visit https://nebios.org ⚠️ Don't download from unknown sources. ⚠️ Virtual machines: NebiOS X requires GPU acceleration. Most hypervisors (VirtualBox, VMware, GNOME Boxes) will show degraded performance. QEMU with 3D acceleration enabled gives the best VM experience. See FAQ for details. System requirements and pre-installation info: https://nebios.org/download (select your version) Full FAQ: https://nebios.org/support/faq
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    5.0 out of 5 stars 1 Review
    Downloads: 155 This Week
    Last Update:
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  • 15
    ANTIRTOS

    ANTIRTOS

    Function pointers queues classes library for Arduino

    ANTIRTOS is a compact real-time operating system (RTOS) written in ANSI C for microcontrollers and embedded systems. It is designed to be simple, portable, and efficient, making it ideal for resource-constrained environments such as IoT devices, robotics, and educational hardware projects. ANTIRTOS features a basic scheduler, support for cooperative and preemptive multitasking, and offers portability across different CPU architectures with minimal changes. Its simplicity and clarity make it a great starting point for learning real-time systems.
    5.0 out of 5 stars 1 Review
    Downloads: 9 This Week
    Last Update:
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  • 16
    Genode

    Genode

    Genode OS Framework

    Genode is a capability-based, component-oriented operating system framework focused on building secure, modular, and flexible operating systems. Unlike monolithic or microkernel-only designs, Genode allows developers to construct OSes from fine-grained components that communicate through well-defined interfaces. It supports multiple kernels including NOVA, seL4, and Fiasco.OC, and has been used to build everything from microhypervisors to full desktops. Genode places strong emphasis on security, fault isolation, and formal verifiability, making it ideal for critical systems and research environments.
    Downloads: 9 This Week
    Last Update:
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  • 17
    Xyris

    Xyris

    The Xyris Kernel

    Xyris is a microkernel-based operating system developed with a focus on modularity, simplicity, and modern code practices. Written in C++, Xyris separates drivers and system services into isolated components using message passing, in line with microkernel philosophy. It’s designed as a research and hobbyist OS, with a clean codebase and early implementations of multitasking, system calls, and filesystem abstractions. Xyris serves as a foundation for further exploration into reliable OS architectures.
    Downloads: 7 This Week
    Last Update:
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  • 18
    ALG

    ALG

    A Fast, Offline, Graphical distribution based on Arch Linux

    October 2025 ISOs have been released! 3 new ISOs - PLASMA, GNOME, XFCE have been released. Thank you to all the members in the ALG community for their support.
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    Downloads: 174 This Week
    Last Update:
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  • 19
    The Fresh Project

    The Fresh Project

    Simply Awesome.

    The official home of Fresh, a One UI-based custom firmware for Samsung devices.
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    Downloads: 170 This Week
    Last Update:
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  • 20
    Berry Linux

    Berry Linux

    A lightweight flavor of Linux based on Fedora

    Berry Linux is a bootable CD Linux, automatic hardware detection. Berry Linux can be used as a Linux demo, educational CD, rescue system. It is not necessary to install anything on a hard disk.
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    4.0 out of 5 stars 1 Review
    Downloads: 91 This Week
    Last Update:
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  • 21
    Matrix0s

    Matrix0s

    New Generation Smart GRID-Decentralized Operating System

    Downloads: 106 This Week
    Last Update:
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  • 22
    Vinari OS 5.0.0 KRYPTON

    Vinari OS 5.0.0 KRYPTON

    Vinari OS 5.0.0 KRYPTON - Debian 13 Trixie based 64-Bit OS

    Vinari OS 5.0.0 KRYPTON represents the next stage in our Debian-based evolution, now built on the 64-bit Debian 13 “Trixie” platform. Designed for both everyday users and developers, this release delivers a polished, reliable, and cohesive experience. At its foundation, Vinari OS 5.0.0 KRYPTON features the modern GNOME desktop environment, refined with practical enhancements such as GSConnect, DashToDock, and other usability-focused extensions. Continuing our focus on simplicity and efficiency, Vinari OS 5.0.0 KRYPTON uses the standard ‘deb’ packaging format for smooth system updates. It also includes seamless Flatpak and Flathub integration out of the box, giving users immediate access to a wide, flexible range of software.
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    4.0 out of 5 stars 1 Review
    Downloads: 47 This Week
    Last Update:
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  • 23
    DracOS GNU/Linux Remastered
    What is DracOS GNU/Linux Remastered ? DracOS GNU/Linux Remastered ( https://github.com/dracos-linux ) is the Linux operating system from Indonesia , open source is built based on Debian live project under the protection of the GNU General Public License v3.0. This operating system is one variant of Linux distributions, which is used to perform security testing (penetration testing). Dracos linux in Arm by hundreds hydraulic pentest, forensics and reverse engineering. Use a GUI-based tools-tools the software using the CLI (command line interface) and GUI (graphical user interface) to perform its operations. Now Dracos currently already up to version 3.1.5 with the code name "KUNTILANAK WITH REMASTERED".
    5.0 out of 5 stars 2 Reviews
    Downloads: 24 This Week
    Last Update:
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  • 24
    BEE free TECH

    BEE free TECH

    [ Beautiful, Effective, Efficient, Freedom, Technology ]

    BEE free 20.04 is a community-driven Linux distribution based on Ubuntu 20.04 .
    4.3 out of 5 stars 6 Reviews
    Downloads: 16 This Week
    Last Update:
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  • 25
    CyanogenMod 13

    CyanogenMod 13

    Android Marshmallow for MSM8930 Samsung Devices

    Pure CyanogenMod 13
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    Downloads: 45 This Week
    Last Update:
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