There are many alternatives to illumos for Windows if you are looking for a replacement. The best Windows alternative is Debian, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to illumos and 13 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to illumos are Windows 10, ReactOS, Windows 11 and Revision (ReviOS).
The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system that we have created is called Debian.
Versatile OS with universal app architecture, free first-year offer for Windows 7 and 8.1 users, redesigned mouse-touch UI, virtual desktop, Microsoft Edge, upgraded security, and enhanced graphics for gaming, supporting fingerprint and face recognition login.
ReactOS™ is a FOSS effort to develop a quality operating system based on the architecture of Microsoft® Windows™ NT family of operating systems, that is compatible with applications and drivers written for it (NT4, 2000, XP, 2003, Vista, 7).
Experience the latest Windows OS with a new Start menu, integrated Teams, and gaming technologies like Auto HDR. Improved security with stricter requirements enhances protection, and seamless Microsoft Account integration makes it ideal for modern devices.
ReviOS aspires to re-create what Windows as an operating system should have been - easy and simple.
MINIX is a POSIX-compliant Unix-like operating system based on a tiny microkernel running in kernel mode with the rest of the operating system running as a number of isolated, protected, processes in user mode.
Xinuos OpenServer™ 10 is a 64-bit operating system based on the popular FreeBSD and designed to support business applications within an enterprise environment.
Based in Ottawa, Ontario, Canada, BlackBerry QNX has provided foundational software for many of the world’s mission-critical embedded systems since 1982. From nuclear power plants, surgical robots and class III life-critical medical devices to autonomous vehicles and brands like...
HP-UX is Hewlett Packard Enterprise's proprietary implementation of the Unix operating system, based on UNIX System V (initially System III) and first released in 1984. Recent versions support the HP 9000 series of computer systems, based on the PA-RISC instruction set...
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