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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    Downloads: 18,998 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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    Downloads: 4,576 This Week
    Last Update:
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  • 3
    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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    Downloads: 3,350 This Week
    Last Update:
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  • 4
    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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    Downloads: 985 This Week
    Last Update:
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  • 5
    Winux Operating System

    Winux Operating System

    Linuxfx Operating System

    Linuxfx is an Ubuntu-based operating system that contains a powerful set of tools and an amazing look and feel. It has compatibility with Windows apps through Wine and also runs Android apps. It's super stable, solid as a rock and very secure. It also does not need TPM or any other requirement for its operation and is compatible with any computer that has 2 cores and 3GB of RAM memory.
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    Downloads: 732 This Week
    Last Update:
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  • 6
    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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    Downloads: 1,587 This Week
    Last Update:
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  • 7
    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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    Downloads: 407 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.
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    Downloads: 145 This Week
    Last Update:
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  • 9
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    Downloads: 145 This Week
    Last Update:
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  • 10
    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: 566 This Week
    Last Update:
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  • 11
    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: 20 This Week
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  • 12
    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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    Downloads: 158 This Week
    Last Update:
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  • 13
    NebiOS Alternative Mirror (Official)

    NebiOS Alternative Mirror (Official)

    An Ubuntu Linux-based OS that aims to end user.

    NebiOS is Ubuntu-based secure, privacy-focused universal OS for daily life, creativity, gaming & more. Official mirror - use if main site has download issues. Main site: nebios.org ⚠️ DON'T DOWNLOAD FROM UNKNOWN SOURCES! === 🚀 NebiOS X Gone GOLD! See you on 1 November 2025. ⚠️ Note on Virtual Machines: NebiOS X is optimized and designed for real hardware performance and native GPU acceleration. Virtualization platforms (VMware, VirtualBox, GNOME Boxes, etc.) may show degraded graphics or system performance. For accurate testing, please install NebiOS X on physical hardware. === 📋 NebiOS 3 Requirements (Stable - Final X11 version): - 64-bit dual-core x86 (Intel/AMD) or ARM, 2GB RAM, 24GB storage - OpenGL 3 GPU (something like Intel HD 4000 or better), Vulkan 1.3 for gaming - Works on 2012+ PCs. Pi 4: 720p 30fps (due hardware limits), Pi 5 not supported (NebiOS X will support)
    Downloads: 157 This Week
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  • 14
    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: 174 This Week
    Last Update:
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  • 15
    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.
    Downloads: 26 This Week
    Last Update:
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  • 16
    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".
    Downloads: 35 This Week
    Last Update:
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  • 17
    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: 3 This Week
    Last Update:
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  • 18
    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: 2 This Week
    Last Update:
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  • 19
    Life

    Life

    Linux for Education based on Ubuntu MATE

    Li-f-e: Linux for Education. A free Linux distribution for education.
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    Downloads: 36 This Week
    Last Update:
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  • 20
    KaNaPi

    KaNaPi

    Educational Linux Distribution

    Main goals: * Prepare operating system based on Linux kernel and free software for use at home from scratch by building sources. Binary packages/images are also available. * Each package is installed in separate directory, so you can use different versions of applications and libraries by design. * There is only one user 'kanapi' with root permissions, so you don't have to login, remember passwords, etc. * Simple configuration * Automatic compilation.
    Downloads: 32 This Week
    Last Update:
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  • 21
    witchOS

    witchOS

    witchOS Buildsystem

    ISO Download via: http://fox-it-potsdam.de/wiso/witchos/live/ These are the sources used to build the witchOS Distribution. witchOS is a mix of LFS and some Arch Linux Packages ported to our Filesystem Hirachy Standard. It is aimed to be a siple way for linux newbies to get started using it on their desktop pc's. We provide a live-dvd with a preconfigured KDE Desktop and an easy to use Graphical Installer. Also we decided to prt and use pacman. The Arch Linux Package Manager. Therefore we are also aa rolling release distribution which means you don't need to reinstall your system with every major milestone we archieve. Just do a system update and reboot ;)
    Downloads: 11 This Week
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  • 22
    DreamStudio by Volocian Studios
    Volocian believes first and foremost that financial status shouldn’t be a barrier to entry in multimedia content creation. Whether you want to design a product or website, record a band, remix a song, or produce a feature length movie with professional post production graphics and effects, Volocian™ wants to help, even if you’re using borrowed hardware with no previous experience. We provide affordable products and services for any budget, including cost-free solutions for education and demo purposes, while everything we do is designed with ease of use and flexibility in mind, to suit everyone from novice hobbyists to expert professionals. Wherever possible, Volocian™ relies on free, open source, and cross-platform software to prevent vendor lock-in, planned obsolescence, and software as a service licensing. While we remain pragmatic about the use of proprietary software, as we’re aware of the feature limitations of some open source solutions, free solutions are preferred.
    Downloads: 11 This Week
    Last Update:
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  • 23
    µOS++ (micro OS plus plus)
    "µOS++" (micro OS plus plus) is an open source, royalty-free, real-time operating system intended for embedded systems built around ARM Cortex M or AVR devices. It is based on a preemptive scheduler written in C++ (more info in the Wiki).
    Downloads: 27 This Week
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  • 24
    Downloads: 15 This Week
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  • 25
    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.
    Downloads: 1 This Week
    Last Update:
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