A super-tiny (512 bytes!) DOS with a My Little Pony schtick. Supports booting a live floppy image in QEMU.
webOS is a web-centric and usability-focused software platform for smart devices, which has proven its performance and stability in over 70 million LG Smart TVs. Since its adaptation to display products, webOS has come a long way and evolved into a software platform applicable to a broader range of products.
The open source project of webOS, called webOS Open Source Edition (OSE), was announced in March 2018 under the philosophy of open platform, open partnership, and open connectivity. On top of the core architecture of webOS, webOS OSE offers additional features that allow extension to more diverse industry verticals.
An interesting operating system with file system compatibility to CP/M-80 (and other similarities).
"What I (Richard A. Leary) have done is attack the software side of the problem in order to make any 6502 system a truly workable disk based system. In addition a degree of compatibility is now possible not only between 6502 systems but with large parts of the world of CP/M systems. The result of my efforts is a system of software which I have named DOS/65."
FreeDOS is a complete, free, DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or develop embedded systems. While we provide some utilities, you should be able to run any program intended for MS-DOS. Pretty much any program that works on MS-DOS will work on FreeDOS. You can also use FreeDOS on a network! However, you may experience problems running Windows on FreeDOS. For example, Windows standard-mode works on FreeDOS, but ‘386-mode Windows for Workgroups 3.11 does not.
C64OS.com has grown from its original purpose as an outlet for me to blog about my adventures in learning to code in 6502 and my progress towards the development of a simple, single–tasking, event–driven operating system. It is growing into a resource for new and returning users of the Commodore 64 and 128 to find out about all the great new things being developed both in hardware and software. The aim of C64 OS is to work with the limitations of the Commodore 64 and enable it to become useful.
MicroPython/CircuitPython DOS-like shell for microcontroller boards like the RasPi Pico and Featherwing.
A portable, open-source 8086 PC emulator for bare metal Raspberry Pi. Boots as its own OS as you'd expect but emulates a MS-DOS machine from the silicon up. Emulates the 8086 and 80186 processor cores. Does CGA, EGA, and VGA graphics. Still in the early stages.
A z80 kernel and a collection of programs, tools and documentation that allows you to assemble an OS that can:
Additionally, the goal of this project is to be as self-contained as possible. With a copy of this project, a capable and creative person should be able to manage to build and install Collapse OS without external resources (i.e. internet) on a machine of her design, built from scavenged parts with low-tech tools.
A boot selector for the Raspberry Pi. Interactively pick, download, and install multiple OSes for the RasPi to the same SD card. The selection can be changed later. Also lets you use USB drives for storing those OSes instead of an SD card. HDMI enabled.
An interactive explorer of the disassemblies of the BASIC ROMs and kernels for the various versions of the Commodore 64. Each ROM is disassembled and lined up side by side so you can see what's different between versions and hardware releases.
An online archive of operating systems from days gone by.
fdpp is a 64-bit DOS core. It is based on a FreeDOS kernel ported to modern C++. In short, FreeDOS plus-plus.
Can be compiled with clang (not gcc!) and booted under dosemu2.
An interactive utility for building custom Raspbian images.
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Of course it runs NetBSD.
The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. As an example of the effect OpenBSD has, the popular OpenSSH software comes from OpenBSD.
The homepage of the man that wrote the Great Worm.