List of the Top 25 Free Operating Systems in 2025

Altima Linux is an open-source operating system that can be personalized to meet individual preferences and comes equipped with a selection of top-tier open-source software applications, making it a viable substitute for Windows and macOS. Built on the robust foundation of Debian Linux, this desktop environment provides all the essential free software necessary for everyday computing tasks. Comprehensive installation guides are available for additional specialized applications, enabling users to revive older computers with free downloads, dispelling the notion that they are obsolete due to excessive bloat. Included among the major applications are LibreOffice, PhotoShack, Inkscape, Sublime Text, QEMU, Nginx, Audacity, VLC Media Player, Epiphany, and Remmina, while VirtualBox is also recommended as a complimentary download. Furthermore, WINE is featured to enhance compatibility with Windows applications. A standout characteristic of Altima Linux is its innovative blend of a Windows-like interface with a Mac-style desktop experience, catering to both novices and seasoned users with a streamlined and intuitive environment. We trust that you will find joy in exploring and utilizing Altima Linux, as it opens up a world of possibilities for your computing needs.

TrueNAS stands out as the most widely used storage software globally. It serves as a comprehensive data platform that enables users to seamlessly embrace a contemporary, open-source method for both storing and safeguarding their expanding data needs. Leveraging the formidable ZFS file system, TrueNAS is open source and delivers unified storage solutions across various formats (File, Block, Object, and Apps), ensuring the reliability and performance essential for virtualization, backup operations, and numerous other data-intensive applications. This flexibility makes it an ideal choice for organizations looking to enhance their data management capabilities.

Qubes OS is a security-focused open-source operating system tailored for desktop users. It leverages Xen-based virtualization technology to create and manage separate isolated environments called qubes. Each qube acts as a virtual machine (VM), fulfilling specific roles such as running various isolated applications for personal or professional needs, managing the network stack, executing firewall functions, or achieving user-defined goals. Thanks to the advanced security features of the Xen hypervisor, Qubes OS delivers a level of protection akin to that utilized by top hosting providers to maintain secure separations between websites and services. For those uncertain about the right Linux distribution for their needs or requiring a specific Windows application for work, Qubes allows the simultaneous operation of multiple operating systems. Furthermore, the integration of Whonix within Qubes facilitates safe and easy access to the Internet anonymously via the Tor network, significantly enhancing your online privacy. This distinctive attribute positions Qubes OS as an exceptional option for users who value both security and the flexibility of their computing experience. Additionally, its innovative approach to isolation and security ensures that users can confidently navigate various online and offline tasks.

PixelOS is a custom ROM developed from AOSP that combines Google applications with all the enjoyable features found in Pixel devices. The aim is to provide a user experience similar to that of Google Pixel smartphones, while also including numerous performance enhancements and a curated selection of additional useful features. This approach guarantees that users not only appreciate the visual appeal of Pixel devices but also benefit from improvements that elevate overall functionality and ease of use. Ultimately, PixelOS seeks to create an optimal environment for users who desire the best of both worlds.

Maximize the performance, reliability, and customization of your Android device. By implementing crDroid, you gain access to an extensive range of personalization options that maintain both efficiency and security. You can change the icons on your home screen, enhance visual effects, and tweak the layout of your quick settings to fit your liking. Choose between gesture navigation for a modern experience or traditional navigation buttons, and further customize the roles of your hardware buttons to meet your needs. Since the lock screen serves as the initial impression for your contacts, transform it into an eye-catching display that reflects your personal style. Your device should embody your character; toggle between light and dark modes and select color palettes that resonate with you to craft a phone that's distinctively yours. With crDroid, the scope for self-expression is nearly limitless, enriching your daily experiences and making them more aligned with your individual preferences. Ultimately, this level of customization ensures that your Android experience is not only functional but also uniquely tailored to who you are.

Sailfish OS offers a European alternative to popular mobile operating systems, featuring a distinctive licensing model that allows for localized adaptations. Since its launch in 2013, it has evolved into its fourth generation, delivering a secure platform designed for dependable mobile solutions. One of the standout features of Sailfish OS is its ability to support Android™ applications through a dedicated App Support function, making it versatile for users. This operating system is not limited to smartphones and tablets; it also shows remarkable adaptability for a variety of embedded devices and applications. The latest iteration, Sailfish 4, brings a host of enhancements aimed at improving support for a wide range of ecosystem initiatives, which can cater to both private corporate environments and public sector governmental needs. In addition, Sailfish OS incorporates sophisticated security features tailored to meet the demands of both business and government users. With Sailfish 4, user data is fully encrypted, and applications benefit from Firejail sandboxing, which provides an additional layer of data security. Moreover, these security advancements position Sailfish OS as an attractive option for organizations that prioritize the protection of sensitive information and privacy, ensuring they can operate effectively in today's digital landscape. As the demand for secure mobile solutions grows, Sailfish OS remains a relevant player in this competitive field.

Artix Linux is a rolling-release distribution that is based on Arch Linux, with a strong focus on utilizing real init systems, as it believes that PID1 should prioritize aspects like simplicity, security, and stability. Users have the option to choose from a variety of init systems, including openrc, runit, s6, suite66, or dinit, and they can install these from any available ISO. The installation can be done through the console or a graphical user interface, catering to different preferences and skill levels. Currently, Artix provides three forms of installation media: base, graphical, and community editions, with the latter being a suitable choice for individuals who may lack extensive experience with Linux. The base installation allows users to begin from any ISO, which is particularly beneficial for those who are facing challenges with wireless network cards or need an active graphical environment during the setup process. Additionally, users have the flexibility to select a different init system than the one initially offered by the installation medium, further enhancing customization. The base ISOs are specifically designed for a fully customizable installation and are intended for use in a TTY, making them ideal for advanced users who are well-versed in the complexities of Linux systems. Ultimately, Artix Linux accommodates a wide array of users, from beginners to seasoned professionals, by offering various installation and configuration options tailored to their needs, ensuring that everyone can find a suitable approach to set up their system. Furthermore, this adaptability underscores Artix's commitment to fostering a user-friendly environment while still appealing to those seeking deeper technical engagement.

A distribution that prioritizes a terminal-centric experience, it is underpinned by a friendly and inviting community. This vibrant and encouraging group acts as a crucial resource throughout your journey with the distribution, helping you navigate its features. Experience the lightweight and adaptable nature of our system by visiting our latest release page for more information and to download it. For those in need of support, the EndeavourOS knowledge base is filled with a variety of wiki articles and video tutorials, providing invaluable assistance as you work to tailor your system to your preferences. Start your unique adventure as you design your own computing experience. If you thrive on hands-on exploration and enjoy a spirit of adventure, this distribution may be the perfect fit for you. Instead of offering a straightforward path to a predetermined destination, EndeavourOS emphasizes the journey of discovery, allowing you to connect with new, friendly faces along the way, making it your own personalized endeavor. Every step you take not only enhances your knowledge but also brings you closer to realizing the full potential of your computing experience, ensuring that your journey is as rewarding as the destination itself.

NomadBSD is a persistent live operating system tailored for USB flash drives and is based on FreeBSD®. It boasts automatic hardware detection and configuration, allowing for instant deployment as a desktop system, while also being useful for tasks like data recovery, educational purposes, or assessing hardware compatibility with FreeBSD®. The images, which can accommodate both 64-bit and 32-bit architectures, require a minimum of 5GB on a USB flash drive, and a system with at least a 1.2GHz CPU and 1GB of RAM is sufficient to run NomadBSD effectively. Users can initiate the system through either BIOS or UEFI methods. A new versioning system has recently been implemented, following the format FFfX-YYYYMMDD, where FF denotes the major two-digit version of FreeBSD, 'f' signifies the minor version, and 'X' indicates the status as ALPHA (A), BETA (B), RC, or RELEASE (R), succeeded by the release date. This modernized versioning system enhances the distribution of images containing different FreeBSD versions, thereby improving the system's versatility and user-friendliness. Furthermore, it allows users to choose the version that best aligns with their specific requirements, fostering a more customized experience. The flexibility in version selection empowers users to tailor their NomadBSD experience to their individual needs and preferences.

Transform your organization's computing infrastructure to guarantee security, manageability, and peak performance consistently. CloudReady provides the benefits of web capabilities devoid of the drawbacks and risks tied to traditional operating systems. It is a contemporary operating system designed to meet both present demands and future developments. Consequently, a diverse range of organizations—including corporations, non-profits, educational entities, and governmental organizations worldwide—trust CloudReady to bolster the security and effectiveness of their devices when engaging with web applications and virtual desktop systems. Based on Google’s Chromium OS, which utilizes the same open-source architecture as Chrome OS, CloudReady is compatible with computers of all ages, accommodating both cutting-edge models and those that are over a decade old. By implementing CloudReady, users enjoy remarkable speed, user-friendliness, and strong security, liberated from hardware limitations, making it an adaptable solution for any organization. Moreover, this flexibility empowers organizations to optimize their current technology investments while remaining competitive in a swiftly changing digital environment, ensuring they are well-equipped for future innovations.

Zorin OS is crafted to be user-friendly, eliminating the need for prior technical knowledge. With the Zorin Appearance application, users can customize their desktop environment to resemble the layout they are accustomed to, whether they come from Windows, macOS, or Linux backgrounds. Built upon a robust foundation of Ubuntu and Linux, Zorin OS leverages the same open-source software utilized by organizations as prestigious as NASA and the U.S. Department of Defense. The operating system benefits from enhanced security features inherent in Linux, making it highly resistant to viruses. Users can expect to receive software updates and security patches for an extended period, ensuring continued system integrity. Zorin OS boasts impressive speed and performance, remaining efficient even during updates. The Lite edition is particularly advantageous for revitalizing computers that are over 15 years old, providing a second chance for aging hardware. Additionally, Zorin OS comes pre-installed with a suite of powerful applications, including a fully compatible office suite akin to Microsoft Office and professional-grade photo editing tools. Beyond these essentials, users can explore a vast array of applications and games available through the Software store and Steam, enhancing the overall experience. This versatility makes Zorin OS an appealing choice for a diverse range of users.

Haiku is an open-source operating system that is constantly evolving and specifically designed for personal computing. It distinguishes itself through its impressive speed, efficiency, and approachability, appealing to users with varying levels of technical knowledge. What truly sets Haiku apart from other alternatives in the open-source arena is its unified development team, which oversees all aspects from the kernel and drivers to userland services, graphics stack, and desktop applications. While Haiku utilizes elements from several open-source projects, it integrates them in a manner that maintains exceptional consistency, which greatly enhances the experience for both users and developers alike. This seamless integration not only adds convenience but also creates an enjoyable navigation experience. The foundations laid by the Be Operating System have paved the way for many innovative features that Haiku proudly embraces, exemplifying an ideal method for efficient and streamlined personal computing. In addition to its unique features, Haiku also fosters a strong community that actively contributes to its continuous improvement, further solidifying its appeal as a powerful yet simple operating system choice. Ultimately, the combination of user-friendliness and robust capabilities makes Haiku a standout option for anyone in search of a dependable operating system.

Discover the benefits of ChromeOS for both PCs and Macs, which embraces a cloud-first, user-friendly, and secure framework. With ChromeOS Flex, you can effortlessly upgrade your existing hardware in an eco-friendly manner at no cost. This system can be deployed across numerous machines or simply trialed to experience the advantages of a cloud-centric operating system firsthand. By opting for ChromeOS Flex, your computers will be fortified against security threats, boot up rapidly, maintain optimal performance over time, receive automatic updates, and can be managed remotely via the cloud. Devices start up efficiently, ensuring minimal downtime while updates occur seamlessly in the background. Users can quickly access virtual desktop infrastructure (VDI) and web applications within a streamlined and reliable setting. ChromeOS Flex can be distributed across your entire network using USB or network installation, and user settings along with policies are synchronized to devices almost instantly. The Google Admin console simplifies remote management, allowing updates and device policy configurations to be handled with ease. Moreover, the integration of sandboxing technology and the restriction on executables negates the need for traditional antivirus solutions, positioning this operating system as an intelligent choice for contemporary businesses. Ultimately, this cutting-edge platform not only bolsters security measures but also significantly enhances workforce productivity and efficiency across the board.

The system comprehensively monitors all web traffic and is capable of blocking certain websites via both HTTP and HTTPS protocols using the Squid proxy. It is seamlessly integrated with ClamAV antivirus software and utilizes site blacklists to bolster security measures. The configuration includes a multi-domain web server driven by a pre-configured LAMP stack, which enables the hosting of several domain names on a single server. Built on the NextCloud platform, it allows users to access their files universally through the web, personal computers, or mobile devices, thus providing the convenience of information retrieval from any location. Furthermore, it offers a private alternative to Slack through the Mattermost platform, ensuring secure collaboration among team members. The user-friendly web interface, constructed on Cockpit, enhances the efficiency of routine administrative tasks and features a rapid and uncomplicated installation process. This infrastructure operates on CentOS/RHEL, a popular server distribution recognized for its regular security updates and outstanding stability, making it a dependable choice for a multitude of applications. With this comprehensive setup, users can enjoy a blend of functional flexibility alongside robust security protocols, empowering teams to work effectively in a secure environment. Moreover, this system’s efficient design aids in streamlining workflows, thereby improving overall productivity.

NetBSD is an entirely free, swift, secure, and remarkably versatile open-source operating system that resembles Unix. It supports a wide range of platforms, including powerful servers, efficient desktop systems, and portable devices. Since its inception in 1993, NetBSD's code has infiltrated many unexpected environments, largely owing to its established reputation for quality, cleanliness, and dependability. It is fundamentally based on 4.4BSD Lite2, which was developed at the University of California, Berkeley. Rather than being a conventional "distribution," NetBSD has evolved over the decades into a unique and all-encompassing operating system within the BSD family, bolstered by a worldwide community of developers. Users enjoy a seamless, well-documented UNIX-like experience characterized by simplicity while also incorporating a plethora of modern features and ensuring compatibility with the latest hardware. This blend of characteristics has established NetBSD as an attractive option for both tech enthusiasts and industry professionals. As it continues to grow, its community remains dedicated to enhancing its capabilities and preserving its core values.

The OpenBSD operating system is entirely crafted by a dedicated group of volunteers. The development environment and various events for developers receive funding through donations that are overseen by The OpenBSD Foundation. These contributions are essential for maintaining the availability and sustainability of OpenBSD as a free operating system. Consequently, the OpenBSD project has implemented cryptographic capabilities across numerous aspects of the system. We emphasize that any cryptographic software used must be free of charge and possess suitable licenses. We deliberately avoid using cryptography that is burdened by problematic patents. Furthermore, we focus on obtaining this software from nations with favorable export laws, as we are dedicated to complying with international regulations. Our decision-making is primarily driven by technical merit, steering clear of political considerations wherever feasible. This unwavering commitment to free software and adherence to legal standards highlights the integrity and principles of the OpenBSD project. The ongoing efforts of the community continue to shape OpenBSD into a secure and reliable operating system for users worldwide.

OS108 is a fast, clear, and secure desktop operating system built upon the NetBSD framework. The name has an interesting origin, as it relates to the fact that a byte is made up of binary bits grouped as 1s and 0s in sets of eight, while also referencing the distance between the Earth and the Sun, which is about 108 times the diameter of the Sun. We are always on the lookout for contributors who want to be actively involved in the project in various ways. Even if you don't have programming skills, there are many ways you can contribute, such as writing how-to guides, crafting user-friendly documentation, or engaging in support forums to help other users. Your participation can greatly enrich the community and enhance the overall experience for all members. Everyone's contribution, no matter the skill level, is valuable and helps foster a collaborative environment.

Guix represents an advanced distribution of the GNU operating system, developed by the GNU Project, that prioritizes user independence. It boasts functionalities like transactional upgrades and the ability to roll back changes, in addition to allowing unprivileged package management, which greatly enhances user flexibility. When used as a standalone distribution, Guix facilitates declarative system configurations that promote transparency and reproducibility in operating systems. It also integrates Guile Scheme APIs featuring high-level embedded domain-specific languages (EDSLs) for the purpose of defining packages and comprehensive system configurations. With a vast repository that houses thousands of packages, Guix grants users access to a diverse array of applications, system utilities, documentation, fonts, and other digital tools, all easily installable via the GNU Guix package manager. Moreover, Guix cultivates a vibrant community that supports collaboration and knowledge sharing, making it an invaluable asset for both developers and users. This community aspect enhances the overall experience, fostering a sense of belonging among those who contribute to and utilize the system.

PLD is a free Linux distribution derived from RPM, founded in 1998, and is tailored for advanced users and administrators ready to trade convenience for enhanced flexibility, frequently necessitating manual setup. With its compatibility across various architectures and a forward-thinking approach to RPM applications, it provides users with a stable operating environment on nearly all hardware platforms. This methodology not only improves usability but also cultivates a vibrant community of users who value the ability to personalize their systems according to their preferences. Additionally, the distribution's commitment to user choice encourages innovative solutions and collaboration among its community members.

Salix is a refined GNU/Linux distribution based on Slackware, prioritizing simplicity, speed, and user accessibility while ensuring robust stability. This distribution remains fully compatible with Slackware, granting users the advantage of accessing Salix's repositories as a supplementary source of high-quality software for their system. Much like a meticulously pruned bonsai, Salix is crafted to be both compact and lightweight, reflecting a dedicated focus on detail. The installation ISO encompasses everything required to set up the system, featuring a complete desktop environment alongside a diverse array of applications that follow the "one application per task" philosophy. Nevertheless, it intentionally excludes a graphical interface, providing only the fundamental components to start a console system. This design choice caters especially to advanced users who desire to customize their installation for specific purposes, such as configuring a web or file server, thus facilitating a tailored computing experience. Furthermore, the adaptability of Salix allows users to build a personalized environment that caters to their individual requirements, enhancing the overall user experience significantly.

Slint emerges as a powerful distribution, characterized by frequent updates to its accessibility software, while other elements receive updates as necessary. Users can seamlessly alternate between console and graphical modes without requiring a system reboot, enhancing convenience. Furthermore, Slint supports the concurrent activation of various graphical environments, which increases its adaptability for diverse tasks. The dashboard of Slint provides quick access to vital tools, relevant information, and helpful links, significantly improving the overall user experience. The installation process, crafted in text mode, is entirely accessible to visually impaired users who rely on a screen reader or Braille display, guiding them through a question-and-answer format complete with online support and built-in documentation. An essential feature of Slint is its implementation of the btrfs file system, organized with subvolumes instead of separate partitions, which optimally reduces the storage space required, eases the creation of snapshots, and is especially advantageous for SSDs, NVMe drives, and USB flash drives. This deliberate architecture not only enhances user-friendliness but also optimizes the management of system resources, ensuring that users can efficiently navigate their computing needs. Overall, Slint stands out as an excellent choice for those seeking a versatile and efficient operating system.

Trisquel is crafted for seamless use in both residential and professional settings, providing easy access to a variety of applications for hassle-free installation. You are encouraged to explore our documentation to learn about the diverse features we offer. Importantly, the standard edition of Trisquel places a strong emphasis on accessibility, ensuring that our manuals work well with screen readers and are supported by numerous educational audio guides. The Trisquel operating system is available for free download, making it accessible to a wide audience. To help sustain our initiatives, we invite you to consider making a donation, joining as a member, or purchasing equipment from ThinkPenguin or Technoetical, which further supports our objectives. Participating in our community not only fosters our growth but also enriches your overall experience with Trisquel, providing you with a chance to connect with like-minded users. Your involvement can make a significant difference in promoting open-source software.

This operating system is ideal for users who want to enhance their computing experience while appreciating a traditional desktop interface. It boasts minimal hardware requirements, making it suitable for modern workstations, single-board computers, and even legacy systems. Ubuntu MATE not only boosts the efficiency of new devices but also breathes new life into older hardware, making them functional again. We are excited to provide pre-configured images tailored for various models, including the Raspberry Pi 2, 3, 3+, and 4, as well as a range of ultra-mobile PCs like the GPD Pocket, GPD Pocket 2, GPD MicroPC, and Topjoy Falcon, offering a flexible solution for a wide array of computing demands. Furthermore, this versatility allows users to choose a setup that fits their specific needs, whether for casual use or more intensive applications.

It includes all the vital software you need for daily tasks, such as managing email, browsing the web, editing documents, playing games, and a wide range of other applications. MidnightBSD, developed by a dedicated but small team of enthusiasts, strives to create an easily accessible operating system that anyone can utilize without charge. This operating system is designed to work with x86 and AMD64 architectures and can also be operated as a virtual machine. Although the FreeBSD project has created a powerful server operating system, it often overlooks the usability and performance features essential for desktop environments. Customizing aspects like scheduling, resource distribution, security protocols, and application support is essential for adequately addressing the needs of desktop users. Many BSD-based initiatives primarily focus on server functionality or legacy systems, and while some versions of FreeBSD provide a more user-friendly graphical interface, they still retain a server-centric architecture. Our choice to fork FreeBSD stemmed not from disagreements but from recognizing it as an outstanding platform to enhance. Ultimately, our mission is to harmonize the efficiency of server systems with the needs of desktop users, creating a seamless experience for all. By doing so, we hope to attract a wider audience and foster a community around this innovative operating system.

OmniOS is a server operating system that is open-source and focuses on incorporating only the most necessary features. Featuring ZFS as its native file system, it combines a volume manager with advanced data protection mechanisms that ensure integrity. Users can easily share storage volumes through various protocols, including iSCSI, CIFS, and NFS. Moreover, OmniOS provides the capability to run lightweight virtual machines, whether they're running OmniOS or Linux in containers, which helps eliminate the overhead typically associated with traditional hypervisors while maintaining effective resource management. For users who require comprehensive hardware virtualization, it also supports virtualization technologies such as bhyve and KVM, enabling the use of diverse guest operating systems like Microsoft Windows and FreeBSD. The network infrastructure can be efficiently virtualized using Crossbow, which facilitates the creation of virtual interfaces and switches, and offers the ability to assign dedicated resources for particular applications. DTrace acts as a sophisticated dynamic tracing framework that significantly aids troubleshooting across the entire software stack, providing real-time instrumentation as necessary. As an open-source initiative, OmniOS operates in a self-hosting manner, with its development actively overseen on GitHub; this platform allows contributors to submit pull requests while granting anyone interested the ability to access the source code to compile their own version. This collaborative environment not only promotes community engagement but also ensures a high level of transparency throughout the development process, encouraging contributions from a diverse range of developers.