Updated on November 7, 2026
FreeBSD, Haiku, ReactOS and FreeDOS are a few operating systems you can explore beyond Windows and Linux. Start with what you want to run and the hardware you have, then check which project supports both. A system’s appearance is only one part of the choice.
Operating systems you can explore
| Operating system | Where it comes from | What you might use it for | Check first |
|---|---|---|---|
| macOS | Apple’s Darwin and XNU platform | Everyday use and Mac apps on supported Apple hardware. | Whether your Mac supports the current release. |
| FreeBSD | BSD Unix | Servers, networking and a desktop you configure yourself. | Device drivers and the packages you need. |
| OpenBSD | BSD Unix | Unix systems and network services. | Supported hardware and application availability. |
| NetBSD | BSD Unix | Exploring a system available for many hardware platforms. | The installation guide for your exact architecture. |
| Haiku | An independent system inspired by BeOS | Trying a different desktop design and native Haiku apps. | Release status, drivers and the apps you rely on. |
| ReactOS | An independent Windows-compatible system | Testing Windows software and learning about compatibility. | Its alpha status and the compatibility of each app. |
| FreeDOS | An independent DOS-compatible system | DOS programs, games and legacy utilities. | Hardware boot support, or use the recommended virtual machine. |
| OpenIndiana | The illumos and OpenSolaris family | Exploring a Solaris-style Unix system. | Its hardware requirements and current package selection. |
These projects have different goals. FreeBSD and the other BSD systems provide their own kernels and system tools. Haiku explores a different desktop environment. ReactOS focuses on compatibility with Windows software. macOS uses Apple’s XNU kernel, whose design combines Mach and BSD components. See Apple’s XNU documentation.
Choose by the task you need to do
- For a server or networking project, check a BSD system’s hardware list, handbook and packages.
- For DOS software, start with FreeDOS in a virtual machine. The project recommends that route for most users.
- For an alternative desktop, try a released Haiku image and check the current hardware and app support.
- For Windows compatibility experiments, use ReactOS in a virtual machine. The project’s FAQ explains the compatibility goal and limits.
An app needs a compatible build or a supported compatibility layer. Check the specific software you need, including your browser, office documents, printer and any specialized tools.
How to try one before replacing your current system
- Choose a current release from the project’s own download page and read its installation guide.
- Check the CPU architecture and virtual machine support. Use the project’s recommended guest settings if it provides them.
- Create a new virtual machine and virtual disk for the test. Our VirtualBox setup guide explains the basic VM controls.
- Try the apps and file formats you need. Before a hardware installation, check the target device’s drivers and back up its files.
For FreeBSD, the official handbook is the starting point. For Haiku, check whether you’re downloading a released image or a nightly build. Its development download page warns that nightly builds can break.
Frequently asked questions
Which operating systems are beyond Windows and Linux?
macOS, FreeBSD, OpenBSD, NetBSD, Haiku, ReactOS, FreeDOS and OpenIndiana are examples. Their hardware support and application catalogs differ.
Is FreeBSD a Linux distribution?
FreeBSD comes from BSD Unix and has its own kernel and base system. Its handbook explains installation, administration and software packages.
Can ReactOS replace Windows on my main PC?
ReactOS remains an alpha project. Try it in a virtual machine and check the specific applications you want to run.
What should I check before installing an OS on an old laptop?
Check the CPU architecture, boot support, Wi-Fi and graphics drivers, and whether the project has usable apps for your needs. A lightweight appearance alone tells you little about hardware compatibility.
What are non-examples of operating systems?
Microsoft Word, Excel, Chrome, Firefox and Photoshop are applications. They run on top of an operating system, which manages the hardware and provides the environment for apps.