Operating Systems for Windows

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

  • One Unified Time Tracking Software For Projects, Billing, Pay and Compliance Icon
    One Unified Time Tracking Software For Projects, Billing, Pay and Compliance

    For companies of all sizes looking for a Time Tracking software

    Replicon's time-tracking platform is scalable and configurable to support the diverse needs of small, mid & large businesses with a remote and globally distributed workforce. Replicon’s Time Tracking is a cloud-based, enterprise-grade solution that tracks employee time across projects, tasks, presence, and absence to facilitate client billing, project costing, and compliant payroll processing. The scalable and configurable platform offers seamless integration with common business technology stacks, such as ERP, CRM, Accounting, and payroll solutions. With AI-powered time capture, mobile apps, and labor compliance as a service, Replicon makes time tracking hassle-free.
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  • ACI Learning: Internal Audit, Cybersecurity, and IT Training Icon
    ACI Learning: Internal Audit, Cybersecurity, and IT Training

    Proven skill building for every aspect of your support or IT team.

    Traditional training doesn't equip employees with the practical skills they need to drive business success. ACI Learning provides hands-on IT and cybersecurity training designed to build real-world, on-the-job skills. Our outcome-based programs empower employees with certification prep, industry-recognized credentials, and flexible learning options. With expert-led video training, labs, and scalable solutions, we help businesses, individuals, governments, and academic institutions develop a skilled workforce, align with business goals, and stay ahead in a rapidly evolving digital world.
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  • 1

    PINN

    PINN is an enhancement of NOOBS

    PINN is an enhancement of NOOBS for the Raspberry Pi. It allows the installation of MULTIPLE OSes on the same SD/HDD/SSD device with an OS chooser when booting. Built-in Admin tools allow you to backup & restore your OSes and fix OS problems by including basic disk checking, password changing, and a command shell.
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    Downloads: 70,736 This Week
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  • 2
    Ufficio Zero Linux OS

    Ufficio Zero Linux OS

    Linux Desktop OS for professionals

    Ufficio Zero Linux OS is a desktop operating system offered in many versions based on PCLinuxOS, Linux Mint and Devuan. We also have created Duplica, a Bare Metal Restore Solution. This distro has many packages for professional use. The project is managed by the Italian company SIITE SRLS and promoted by the Italian Association Boost Media APS. Ufficio Zero Linux OS is trademarked through the Linux Mark Institute. All rights reserved. Linux® is the registered trademark of Linus Torvalds in the U.S. and other countries. website https://ufficiozero.org forum https://forum.ufficiozero.org wiki https://wiki.ufficiozero.org Follow us on our socials https://l.devol.it/@ufficiozero Boost Media APS https://boostmedia.it
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    Downloads: 47,127 This Week
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  • 3
    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: 19,510 This Week
    Last Update:
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  • 4
    Bodhi Linux

    Bodhi Linux

    A minimalist, enlightened Linux distribution

    Bodhi is a minimalistic, enlightened, Linux desktop. Bodhi Linux is extremely lightweight and highly customizable. Bodhi is suitable for both Linux newcomers and experienced users. The Ubuntu LTS assures stability for years and the Bodhi Team is very open to all suggestions and requests from users and willing to help.
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    Downloads: 6,255 This Week
    Last Update:
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  • The Secure And Reliable File Transfer Solution That You Control. Icon
    The Secure And Reliable File Transfer Solution That You Control.

    Helping IT professionals responsibly secure the world's data

    Cerberus offers a variety of secure file transfer solutions to fit businesses of any size or business sector, including finance, technology, education, publishing, law offices, local, state, and federal government agencies, hospitals and many more.
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  • 5
    Rufus

    Rufus

    Utility to create bootable USB flash drives

    Rufus is a standalone app designed to format and create a bootable USB drive for a large variety of ISOs. The app is just over 1MB in size and is notably faster than similar competitor apps such as the Windows 7 USB utility, Universal USB Installer, and UNetbootin. Rufus can come in handy when you need to simply format a USB drive, install an OS on a machine that lacks a CD/DVD-ROM drive, or when you need to boot an operating system temporarily without intentions of actually installing the media. This can be immensely useful while you're on the go or just need access to an OS for a temporary, isolated reason. The app can even be used to flash firmware to BIOS or other destinations by just using DOS. Even though Rufus is a tiny utility in comparison to other USB creation tools that can be rather bulky in size, it contends easily with the competition and creates bootable USB drives in record time!
    Downloads: 1,126 This Week
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  • 6
    BluestarLinux
    Bluestar Linux is an Arch Linux-based distribution, built with an understanding that people want and need a solid Operating System that provides a breadth of functionality and ease of use without sacrificing aesthetics. Bluestar is offered in three edtions - desktop, deskpro and developer - each tailored to address the needs of a variety of Linux users. Bluestar can be installed permanently as a robust and fully configurable operating system on a laptop or desktop system, or it can be run effectively as a live installer and supports the addition of persistent storage for those who choose not to perform a permanent installation. A Bluestar Linux software respository is also maintained in order to provide additional tools and applications when needed or requested. Bluestar provides the following features: Up-to-date Kernel Wide Variety of Applications - Always Current Versions Full Development / Desktop / Multimedia Environment
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    Downloads: 26,863 This Week
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  • 7
    blissos-dev

    blissos-dev

    Android for your PC, but more Blissful

    Bliss OS (x86) Android for your PC An Open Source OS, based on Android, that incorporates many optimizations, features, and expanded device support. And it is available for just about any Chromebook, Windows/Linux PC or tablet released in the last 4 years Our support options use Telegram chats. Bliss OS (x86) Support chat: https://t.me/blissx86 Bliss ROM/OS Build Support chat: https://t.me/Team_Bliss_Build_Support Android-Generic Project development chat: https://t.me/androidgenericpc
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    Downloads: 4,256 This Week
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  • 8
    Alt-F

    Alt-F

    free alternative firmware for the DLink DNS-320/320L/321/323/325/327L

    Alt-F provides a free and open source alternative firmware for the DLINK DNS-320/320L/321/323/325/327L and DNR-322L. Alt-F has Samba and NFS; supports ext2/3/4, VFAT, NTFS, BTRFS; RAID 0, 1, 5 (with external USB disk) and JBOD; supports up to 8TB disks; rsync, ftp, sftp, ftps, ssh, lpd, DNS and DHCP servers, DDNS, fan and leds control, clean power up and down... and more. Alt-F also has a set of comprehensive administering web pages, you don't need to use the command line to configure it. Besides the built-in software, Alt-F also supports additional packages on disk, including ffp and Entware packages, that you can install, update and uninstall using the administering web pages Alt-F is being developed and tested on a DNS-323-rev-A1/B1, a DNS325-rev-A1, a DNS-320L-rev-A1 and on a DNS-327L-rev-A1 hardware boards. Other models and boards are said to work. Support Forum: http://groups.google.com/group/alt-f Homepage: http://sites.google.com/site/altfirmware
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    Downloads: 2,468 This Week
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  • 9
    Rescatux

    Rescatux

    Easy to use Repair distribution for both Gnu/Linux and Windows systems

    Rescatux is a GNU/Linux repair cd (and eventually also Windows) but it is not like other rescue disks. Rescatux comes with Rescapp. Rescapp is a nice wizard that will guide you through your rescue and repair tasks. When the wizard is not able to solve your problem you can also enjoy of Rescatux unique support features: * Chat: Open the chat for asking help directly in Rescatux channel. * Share log: After running an option you can share its log (the action registry that it has done) so that in the chat they can help you better. O better, even, you can help debug and fix Rescatux bugs on the fly. * Share log on forum: Prepares a forum post alike text so that you can just copy and paste it in your favourite forum. Logs are nicely inserted into it with [CODE] symbols. * Boot Info Script: Run Boot Info Script option to share your computer configuration (specially boot one).
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    Downloads: 1,574 This Week
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  • LinkSquares: All-in-One Contract Management Platform Icon
    LinkSquares: All-in-One Contract Management Platform

    #1 Customer Rated CLM Any Contract. Every Department. One Platform.

    LinkSquares is the leading Contract Lifecycle Management (CLM) software designed to help legal, procurement, and business operations teams master the entire contract lifecycle, from creation to execution and renewal. The platform transforms how companies manage agreements by centralizing data, automating routine work, and providing actionable insights powered by AI. This single, connected source of truth helps teams eliminate manual processes, streamline workflows, boost visibility, and ensure compliance across thousands of contracts, ultimately reducing risk and administrative burden.
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  • 10
    Mabox Linux

    Mabox Linux

    Lightweight ready to use OpenBox Desktop Rolling-release Manjaro based

    Mabox is a Manjaro based, desktop Linux distribution. The project ships with Openbox as the default desktop with pinch of customistations and home-brewed tools, like improved menu, side-panels and Mabox Control Center. Works great even on weaker computers.
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    Downloads: 1,379 This Week
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  • 11
    Linuxfx Winux OS

    Linuxfx Winux OS

    Winux Operating System by Linuxfx

    Windows Theme Over Linux a.k.a "Winux" is a super secure Linux operating system that is completely inspired by Microsoft Windows, but does not require any special hardware requirements and can be installed.
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    Downloads: 1,294 This Week
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  • 12
    Redo Rescue: Backup and Recovery

    Redo Rescue: Backup and Recovery

    Backup and Recovery Made Easy

    Redo Rescue Backup and Recovery can backup and restore an entire system in minutes with a point-and-click interface anyone can use. Bare metal restore to a new, blank drive and be up and running in minutes. Supports saving to and restoring from local disks or shared network drives. Selectively restore partitions and remap them to different locations on the target drive. Additional tools included for partition editing, web browsing, and more. Runs from live CD/USB; no installation needed. Website: http://redorescue.com Forum: https://sourceforge.net/p/redobackup/discussion/ GitHub: https://github.com/redorescue/redorescue Wikipedia: https://en.wikipedia.org/wiki/Redo_Backup_and_Recovery
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    Downloads: 1,014 This Week
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  • 13
    ArkOS

    ArkOS

    Another rockchip Operating System

    Another rockchip Operating System. This OS came about from an initial fork of The Retro Arena to support a roms folder on a NTFS partition so that the management of roms could be done by simply putting you SD card into an appropriate card reader on a Windows 10 computer. Through various upgrades and tweaks overtime, it has diverged significantly from TheRA and it's time to rebrand this distro. With suggestions provided by community members, ArkOS was chosen.
    Downloads: 222 This Week
    Last Update:
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  • 14
    Tuxboot helps you to create a bootable Live USB drive for Clonezilla live, DRBL live, Gparted live and tux2live. It is modified from unetbootin and runs on both MS Windows and GNU/Linux. You can choose to download the latest version of ISO file then create the live usb.
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    Downloads: 755 This Week
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  • 15
    UNetbootin

    UNetbootin

    Bootable live USB creator for Ubuntu, Fedora, and Linux distributions

    UNetbootin allows you to create bootable Live USB drives for Ubuntu, Fedora, and other Linux distributions without burning a CD. It runs on Windows, Linux, and Mac OS X. You can either let UNetbootin download one of the many distributions supported out-of-the-box for you, or supply your own Linux .iso file.
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    Downloads: 630 This Week
    Last Update:
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  • 16
    LxPup - Puppy Linux + LXDE

    LxPup - Puppy Linux + LXDE

    Puppy Linux with the LXDE desktop environment

    LxPup is a version of Puppy Linux using the LXDE desktop environment and is an updated “descendent” of loukitchou’s LxPup13.01. LxPup offers the Openbox window manager, LxPanel panel manager and PCManFM file manager. There are various "flavours" of LxPup some built as derivatives of official Puppy Linux builds (based on Slackware and Ubuntu components) and one a new woof-ce build (Slackware based). The various flavours offer different kernels and access to the software repositories of the base system. LxPup combines all the significant advantages of Puppy Linux - small iso size, extensive hardware support, wide range of applications built-in, live cd and frugal installs, friendly supportive user forum etc etc, with the lightweight but modern LXDE desktop environment. Visit the support website for more details.
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    Downloads: 1,017 This Week
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  • 17
    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: 721 This Week
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  • 18
    Thinstation is a thin client linux distro using std. x86 hw. It can boot from network, pxe, syslinux, CD, floppy or flash-disk and connect to servers using VNC, RDP, XDM, SSH, Telnet, tn5250, tarentella, 2X, NX, Thinlinc, VMWare VDI or ICA.
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    Downloads: 553 This Week
    Last Update:
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  • 19
    openFyde

    openFyde

    openFyde supported hardware "x86 PC with Intel HD graphics

    overlay-amd64-openfyde is the official overlay repository for the amd64 (x86_64) build of openFyde, a Chromium OS-based distribution tailored for developers, power users, and alternative devices outside of Google's supported ChromeOS hardware. openFyde offers a fast, secure, and web-centric desktop experience with support for Linux apps, Android containers, and cloud integration. This overlay includes the custom configurations and firmware patches necessary to optimize openFyde for generic x86_64 devices such as laptops and desktops.
    Downloads: 89 This Week
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  • 20
    Tiny 11 Releases

    Tiny 11 Releases

    Automated tools for creating streamlined Windows 11 images with CI/CD.

    Tiny11 Automated Builder: Build Tiny11, Build Tiny11 Core and Build Nano11 Automated tools for creating streamlined Windows 11 images with CI/CD support. 📋 Overview Tiny11 Automated Builder provides PowerShell scripts to create minimized Windows 11 ISO images by removing bloatware, disabling telemetry, and optimizing system components.
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    Downloads: 2,226 This Week
    Last Update:
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  • 21
    Vanilla OS Live ISO Builder

    Vanilla OS Live ISO Builder

    Vanilla OS Live ISO Builder.

    Vanilla OS Live ISO provides the official live environment and installer for Vanilla OS, a Linux distribution that blends immutability, security, and user-friendliness. Built on Ubuntu with an immutable root file system, Vanilla OS uses ABRoot and Distrobox to offer transactional updates and containerized app environments. The live ISO project enables users to boot and test the OS without installation, and includes the Calamares installer to simplify the setup process. It ensures users can preview the experience, hardware compatibility, and performance before committing.
    Downloads: 76 This Week
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  • 22
    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: 73 This Week
    Last Update:
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  • 23
    ThoriumOS

    ThoriumOS

    ChromiumOS fork with Thorium Browser, x264/x265 codecs

    ThoriumOS is an experimental Chromium OS fork maintained by the creator of the Thorium web browser. It is focused on optimizing Chrome OS for performance, developer control, and flexibility, especially on legacy or non-Google hardware. ThoriumOS provides a fast and lightweight desktop environment centered around the Chromium browser, aiming to give users a secure, privacy-respecting, and efficient alternative operating system. The project builds on Chromium OS's open-source base while stripping unnecessary components and adding user-requested features.
    Downloads: 50 This Week
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  • 24
    STAR

    STAR

    Travel light, run fast, just works! Devuan powered!

    This is the home of Star live distro powered by Devuan stable linux (Non-Systemd). Images to choose from: 64 bit - Xfce (minimal), Fluxbox, Openbox, Jwm, i3, Cli 32bit - Jwm, Cli There is a small selection of applications, including: web browser, text editor, image viewer, pdf viewer, file manager, terminal, media player. If you like to customize your desktop, then this is the distro you you! This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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    Downloads: 211 This Week
    Last Update:
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  • 25
    Talos Linux

    Talos Linux

    Talos Linux is a modern Linux distribution built for Kubernetes

    Talos Linux is Linux designed for Kubernetes – secure, immutable, and minimal. Supports cloud platforms, bare metal, and virtualization platforms. All system management is done via an API. No SSH, shell or console. Production-ready supports some of the largest Kubernetes clusters in the world. Open source project from the team at Sidero Labs. It only takes 3 minutes to launch a Talos cluster on your laptop inside Docker. Talos reduces your attack surface. It's minimal, hardened and immutable. All API access is secured with mutual TLS (mTLS) authentication. Talos eliminates configuration drift, reduces unknown factors by employing immutable infrastructure ideology, and delivers atomic updates. Talos simplifies your architecture, increases your agility, and always delivers current stable Kubernetes and Linux versions. Talos consists of only a handful of binaries and shared libraries: just enough to run containerd and a small set of system services.
    Downloads: 38 This Week
    Last Update:
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