RetroBSD is a port of 2.11BSD Unix intended for embedded systems with fixed memory mapping. The current target is Microchip PIC32 microcontroller with 128 kbytes of RAM and 512 kbytes of Flash.
FreeBSD Alternatives
FreeBSD is described as 'Operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of' and is a very popular operating system in the os & utilities category. There are more than 100 alternatives to FreeBSD for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best FreeBSD alternative is Linux Mint, which is both free and Open Source. Other great apps like FreeBSD are Ubuntu, Debian, Fedora and Arch Linux.
Alternatives list
Athena OS is an Arch-derived Linux distribution designed for penetration testing, bug-bounty hunting and InfoSec students. The distribution provides a way to connect directly to some of the e-learning hacking resources, such as Hack The Box, Offensive Security, PWNX and InfoSec...



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Beautiful, Open, and Free - Trenta OS is a Linux based operating system that aims to compete graphically with some well known premium operating systems but in the free & open-source Linux world.
Cost / License
- Free
- Open Source
Platforms
- Linux
The Zeal Operating System is a modernized, professional fork of the 64-bit Temple Operating System. Guiding principles of development include transparency, full user control, and adherence to public-domain/open-source implementations.





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AmigaOS is the proprietary native operating system of the Amiga and AmigaOne personal computers, introduced with the launch of the first Amiga, the Amiga 1000, in 1985.


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Minoca OS is a general purpose operating system designed specifically for feature-rich embedded devices. It's got all the high-level functionality that you've come to expect from an operating system, but offers it in a fraction of the memory footprint.


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An open-source OS for exploration, creation, and play. Kano OS is based on the Raspbian OS which itself is based on Debian, a Linux based operating system.


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Infinitive OS is an open-source project created to replace windows and macOS, it mounts the latest versions of the Linux kernel and contains open source components but also proprietary software. It has the KDE desktop environment pre-installed
Cost / License
- Free
- Proprietary
Platforms
- Linux


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Enso aims to be a clean and simple OS that is easy to use and incorporates some of our favourite projects from around the Linux world.


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