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
    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: 5,793 This Week
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  • 2
    ReactOS

    ReactOS

    An operating system based on the best Windows NT design principles

    ReactOS is an open source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft Windows NT family of operating systems (NT4, 2000, XP, 2003).
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    Downloads: 2,848 This Week
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  • 3
    deepin
    deepin is a Debian-based distribution that aims to provide an elegant, user-friendly and reliable operating system. It does not only include the best the open source world has to offer, but it has also created its own desktop environment called DDE or Deepin Desktop Environment which is based on the Qt 5 toolkit. Deepin focuses much of its attention on intuitive design. Its home-grown applications, like Deepin Software Centre, DMusic and DPlayer are tailored to the average user. Being easy to install and use, deepin can be a good Windows alternative for office and home use.
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    Downloads: 2,301 This Week
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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: 980 This Week
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  • 5

    Kernelloader

    Run Linux on the Playstation 2

    Kernelloader is a free bootloader for PS2 Linux and other Playstation 2 operating systems. Loading can be done by "Action Replay Media Player", by "memory card exploit", by "FMCB" or any other homebrew loading method. If you downloaded the latest Linux Live DVD, you need to run the online updater to be able to play Youtube videos.
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    Downloads: 543 This Week
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  • 6
    AROS Research Operating System
    The AROS Research Operating System is an effort to implement an Open Source and portable operating system that is compatible with AmigaOS(TM). Originally, it was meant as a direct reimplementation, but already has features not existing in AmigaOS.
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    Downloads: 560 This Week
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  • 7
    RichARCH

    RichARCH

    Your concierge creating a Rich experience to Arch

    RichARCH is designed to be a Quick Simpler Path to Arch with automation and ricing options. * Just one command line to start the latest complete installer for Arch. One goal is to only use packages in the basic Arch Linux repos by default with the option to install some non-standard packages. Our hope is that this will help to make Arch Linux more approachable to individual and corporate users. GUIs: Budgie/Cinnamon/Cosmic/Enlightenment/Gnome/Hyprland/KDE/Labwc/LXDE/LXQT/Mate/Niri/River/Sway/XFCE Kernels: linux/linux-cachyos/linux-hardened/linux-lqx/linux-lts/linux-nitrous/linux-tachyon/linux-zen/linux-znver2/linux-znver3/linux-znver4/linux-znver5 Profiles: SecOps/Server/Omarchy/DonArch/HyprVibe/KoolsDots/SaatvikDots/ShellNinja/VaelixdDots More info at: https://download.sourceforge.net/richarch/InstallAndInfo.pdf https://sourceforge.net/projects/richarch/files/README.md/download https://www.youtube.com/watch?v=hjK67kdHkGU&t=6s
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    Downloads: 1,417 This Week
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  • 8
    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: 1,305 This Week
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  • 9
    Sandboxie

    Sandboxie

    Sandboxie Plus & Classic

    Sandboxie (and its enhanced fork Sandboxie Plus) is an open-source sandboxing tool for Windows NT-based systems. It creates isolated virtual environments in which applications can run safely without permanently modifying the system, ideal for testing untrusted software. Sandboxie Classic has the old no longer developed MFC-based UI, hence it lacks native interface support for Plus features. Although some of the missing features can be configured manually in the Sandboxie.ini configuration file or even replaced with custom scripts, the Classic edition is not recommended for users who want to explore the latest security options. A completely different token creation mechanism from Sandboxie's pre-open-source version makes sandboxes more independent in the system.
    Downloads: 74 This Week
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  • 10
    Ultimate Edition

    Ultimate Edition

    An Ubuntu remix for both new and experienced Linux sophisticates

    Ultimate Edition Linux, previously "Ubuntu Ultimate Edition". We cater to a large base of *nix users including, but certainly not limited to gamers & low resource computers. We have a Ultimate Edition for virtually any user.
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    Downloads: 240 This Week
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  • 11
    Ancient UNIX/BSD emulation on Windows
    Providing an easy to use platform for running Ancient UNIX & BSD on windows.
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    Downloads: 219 This Week
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  • 12
    OpenWrt

    OpenWrt

    A Linux operating system targeting embedded devices

    OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.
    Downloads: 30 This Week
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  • 13
    Br OS
    O nome Br OS tem dois significados, Br vem de Brasil, o paĂ­s de origem do sistema, OS Ă© Operating System, e a junĂ§Ă£o do nome fica Bros, que Ă© uma gĂ­ria norte americana para Brothers, que significa IrmĂ£os. Basicamente o que queremos dizer Ă© que nosso sistema foi feito para unir pessoas, seja pelo conteĂºdo gerado por ele, ou pela comunidade que ele forma. Somos um sĂ³ povo.
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    Downloads: 281 This Week
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  • 14
    LEAF Linux Embedded Appliance Framework

    LEAF Linux Embedded Appliance Framework

    A secure, feature-rich, customizable embedded Linux network appliance

    A secure, feature-rich, customizable embedded Linux network appliance for use in a variety of network topologies. Although it can be used in other ways; its primarily used as a Internet gateway, router, firewall, and wireless access point. LEAF documentation wiki http://bering-uclibc.zetam.org
    Downloads: 250 This Week
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  • 15
    IPCop Firewall

    IPCop Firewall

    Linux firewall distribution geared towards home and SOHO users.

    The IPCop Firewall is a Linux firewall distribution. It is geared towards home and SOHO users. The IPCop web-interface is very user-friendly and makes usage easy.
    Downloads: 94 This Week
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  • 16
    KaeilOS

    KaeilOS

    Koan Advanced Embedded Industrial Linux Operating System

    KaeilOS is an embedded linux GNU/GPL distribution composed of a collection of the best publicly available Open Source packages. Version 4.00 available since January 2009 has joined OpenEmbedded project offering a wider selection of packages and recipes.
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    Downloads: 503 This Week
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  • 17
    DreamShell

    DreamShell

    Operating system for the Sega Dreamcast

    The Dreamshell is the operating system for the Sega Dreamcast based on the KallistiOS kernel. It has a dynamic loadable modular system and interface for creating applications with XML UI and both C/C++ and Lua scripts on. You can see examples in ready-made applications and modules, drivers for various devices, formats and interfaces. Examples for audio and video decoding, compression, packaging, binding, network, emulation, scripts and more. From hardcore low-level assembler to high-level applications. There is also large subproject is the ISO Loader, which contains emulation of BIOS system calls, CDDA playback, and VMU, also it can hooking interrupts for various SDKs and more.
    Downloads: 18 This Week
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  • 18
    Pony OS

    Pony OS

    My Little Unix: Kernels are Magic

    ponyos is a lightweight, UNIX-like operating system developed as a personal hobby project by the creator of ToaruOS. It features a monolithic kernel written in C and aims for a POSIX-compliant environment with a built-from-scratch userland. ponyos includes a graphical interface, dynamic linker, shared libraries, and a package manager. It’s designed for fun, experimentation, and as a platform to learn and play with operating system internals, with surprisingly advanced features given its hobbyist origin.
    Downloads: 18 This Week
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  • 19
    fake lezard  ByFL nitrogen MI MAX 3 roms

    fake lezard ByFL nitrogen MI MAX 3 roms

    MI MAX 3 COMMUNITY DRIVEN ROM Android 11-16 nitrogen

    ROMS From Fake Lezard on nitrogen Alias (ByFL) ROM for Xiaomi MI MAX 3 Stable and Fast Android 11 to 16 ports for nitrogen. Custom Snake/Neo Kernel optimized for performance. Cleaned system and vendor partitions (ByFL). Includes essential tools (Mi Flash, Drivers, Recovery).
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    Downloads: 204 This Week
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  • 20
    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: 61 This Week
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  • 21
    NamelessROM

    NamelessROM

    Custom ROM for Android

    NamelessRom is opportunity; an opportunity to have a voice to the development team of the after-market firmware that you run on your device. The main goal of NamelessRom is to provide quality development for android devices, phones, and tablets alike. NamelessRom developers are available nearly 24/7 and respond to bug reports and feature requests almost instantly. This availability will allow you, the end-user, to have direct input into exactly what features and functions are included on the firmware that YOU run. NamelessRom == endless possibilities. Unless you have an iPhone, then you're out of luck. Get more information and find support on our forums at https://nameless-rom.org
    Downloads: 271 This Week
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  • 22
    Nightingale OS

    Nightingale OS

    A small operating system where I experiment and learn osdev

    nightingale is a modern hobby operating system developed in Rust, focusing on safety, simplicity, and minimalism. It aims to be a clean platform for experimentation and learning, implementing a small kernel with core features like multitasking, memory protection, and a minimal filesystem. Its use of Rust provides strong guarantees around memory safety and eliminates common bugs found in low-level C-based systems. nightingale is ideal for those seeking to study OS development using a modern language with a strong safety model.
    Downloads: 10 This Week
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  • 23
    Mobilinux - Linux for Android

    Mobilinux - Linux for Android

    This application will allow you to install and run Linux on Android !

    The app supports ROOTED as well as NOROOTED devices. Use your mobile as a Pocket PC !! For Root Method: The application creates a disk image on a flash card, mounts it and installs an OS distribution. Applications of the new system are run in a chroot environment and working together with the Android platform. All changes made on the device are reversible, i.e. the application and components can be removed completely. Installation of a distribution is done by downloading files from official mirrors online over the internet. The application requires superuser rights (ROOT).Installing a new operating system takes about 15 minutes. The recommended minimum size of a disk image is 1024 MB (with LXDE), and without a GUI - 512 MB. Noroot Method: Install MOBICONSOLE addon and then install the linux on a non-rooted phone.
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    Downloads: 139 This Week
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  • 24
    Robolinux

    Robolinux

    Announcing Robolinux Cinnamon 14.1

    Announcing The New Robolinux Series 14 Mate LTS - 2034 Robolinux is very pleased to announce a completely new 14.1 Mate privacy centered 1inux operating system you can download freely while also offering our users an optional 14+ advanced upgrade which comes with our Untracker and FAAST Boot along with one click popular privacy software installers like Tor and I2p, Wireshark and Bleachbit plus many more for a fair and reasonable price. Robolinux14.1-Mate is ideal for beginners and advanced users. We are proud that it comes with Enoch AI which is TOTALLY 100% PRIVATE, FREE, HONEST & UNCENSORED built into Robolinux Cinnamon 14.1 The Robolinux 14.1 version with rock solid Long Term Support through 2034! requires users to set secure boot in their BIOS. It is currently available in the Cinnamon desktop flavor. we will release series 14 Xfce version in the next two months.For more information please see Readme file. Warmest regards John Martinson Robolinux.org
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    Downloads: 54 This Week
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  • 25
    Resea

    Resea

    A microkernel-based hackable operating system

    resea is a small, message-passing-based operating system kernel designed with microkernel principles in mind. Written in C with minimal dependencies, it emphasizes modularity, isolation, and simplicity. resea includes a basic POSIX-like interface and supports multitasking, IPC, and user-space services. It serves as both a microkernel OS experiment and a platform for learning about low-level system design without the complexity of larger operating systems.
    Downloads: 9 This Week
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