Freedom251 › IT & Infrastructure

Free and open first

Best Server Operating System in 2026

• 29 apps
• Research read 28 Sept 2026
• How the order is worked out

1. 1 A

   AlmaLinux OS

   Free plan Open source APILinuxSelf-hosted+1

   AlmaLinux OS offers broad deployment options, security errata, and community support without a distribution fee. Its stated update plans vary by major version, and commercial support is separate.

   9.3 Free plan Visit site
2. 2 A

   Alpine Linux

   Free plan LinuxSelf-hosted

   Choose Alpine Linux if you need a free, compact distribution with image options spanning hardware, virtual systems and containers.

   7.4 Free plan Visit site
3. 3 A

   Amazon Linux

   Free plan LinuxSelf-hosted

   Choose AL2023 for AWS-oriented Linux deployments that need EC2 integration, selectable updates, and a support lifecycle through June 30, 2029.

   7.3 Free plan Visit site
4. 4 C

   CentOS Stream

   Free plan LinuxSelf-hosted

   CentOS Stream offers a free, open development platform that can also serve production and preview needs.

   7.3 Free plan Visit site
5. 5 D

   Debian

   Free plan LinuxSelf-hosted

   Debian offers a large package collection, broad architecture support, and multiple installation and deployment options at no cost.

   7.3 Free plan Visit site
6. 6

   Nix

   by Nix

   Free plan LinuxMacSelf-hosted+1

   Nix offers package management, system configuration, and a broad set of reproducible-build and deployment capabilities at no listed cost.

   7.3 Free plan Visit site
7. 7 F

   Fedora CoreOS

   Free plan LinuxSelf-hosted

   Pick Fedora CoreOS when you need a minimal Linux host for containerized workloads across physical, virtual, or cloud infrastructure.

   7.2 Free plan Visit site
8. 8 F

   FreeBSD gpart

   Free plan Self-hosted

   gpart provides partition management, inspection, backup, and recovery actions within FreeBSD’s GEOM system.

   7.0 Free plan Visit site
9. 9 N

   NetBSD

   Free plan Self-hosted

   NetBSD offers broad hardware reach, package management, and an integrated Unix-like system. Choose a supported formal release when continued bug and security fixes are important.

   6.9 Free plan Visit site
10. 10 O

    OmniOS

    Free plan LinuxSelf-hosted

    OmniOS combines illumos-based server operation with ZFS, containers, virtualization, networking, and tracing tools.

    6.9 Free plan Visit site
11. 11 O

    OpenIndiana

    Free plan LinuxSelf-hosted

    OpenIndiana provides a free illumos-based operating system with desktop and command-line operation, extensive system technologies, and several package sources.

    6.9 Free plan Visit site
12. 12 R

    Rocky Linux

    Free plan LinuxSelf-hostedWindows

    Rocky Linux offers a free RHEL-compatible system with broad deployment formats and a long major-release lifecycle.

    6.8 Free plan Visit site
13. 13 P

    Photon OS

    Free plan LinuxSelf-hosted

    Photon OS combines a small-system package manager and hardened Linux base with deployment options for containers, Kubernetes, cloud, and edge workloads.

    6.7 Free plan Visit site
14. 14 O

    Oracle Solaris

    Free plan Self-hosted

    Oracle Solaris combines enterprise deployment choices with package, lifecycle, observability, security, and compliance tooling.

    6.6 Free plan Visit site
15. 15 U

    Ubuntu Server

    Free plan LinuxSelf-hosted

    Ubuntu Server covers a range of deployment environments and architectures, with five years of standard LTS security maintenance.

    6.6 Free plan · paid from $25/yr · 30-day trial Visit site
16. 16 B

    Bottlerocket

    Free plan Linux
    6.1 Free plan Visit site
17. 17 D

    DragonFly BSD

    Free plan Linux
    6.0 Free plan Visit site
18. 18 G

    Google Container-Optimized OS

    Free plan Linux
    5.9 Free plan Visit site
19. 19 K

    Kairos

    Free plan LinuxWeb
    5.9 Free plan Visit site
20. 20 I

    illumos

    Free plan Linux
    5.8 Free plan Visit site
21. 21 O

    openEuler

    Free plan Linux
    5.7 Free plan Visit site
22. 22 O

    openSUSE MicroOS

    Free plan Linux
    5.6 Free plan Visit site
23. 23 O

    OpenBSD httpd

    Free plan
    5.5 Free plan Visit site
24. 24 S

    SUSE Linux Micro

    Free plan Linux
    5.4 Free plan · pricing on request Visit site
25. 25

    Oracle Linux Virtualization Manager

    Paid LinuxWeb

    Oracle Linux Virtualization Manager provides operational management features for Oracle Linux KVM in a self-hosted package.

    4.4 Open source Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

More in IT & Infrastructure

• Active Directory Management Software25
• Application Deployment Software44
• Application Security Posture Management Software17
• Attack Surface Management Software33
• Backup and Disaster Recovery Software36
• Breach and Attack Simulation Software20
• Business Antivirus Software24
• Cloud Automation Software32
• Cloud Detection and Response Software25
• Cloud Governance Software26
• Cloud Infrastructure Entitlement Management Software25
• Cloud-Native Application Protection Platforms21