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OSI-Approved Open Source (627)
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The ppcOS is a hobby operating system.
It is a minimal linux like kernel for x86 architecture. It is mostly the source code from the tutorial "Roll your own toy UNIX-clone OS" written by James Molloy: http://www.jamesmolloy.co.uk/tutorial_html/index.html It is encoded in a bash script.1 weekly downloads
H2O-OS is a light but tough little operating system. With the ability to self heal and R.B.G (Random Byte-code Generation) it's virtually un-stoppable (of course unless you pull the plug)
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AO RTOS is small real time OS based on Active Object concurrency model1 weekly downloads
Hobby DOS is a Disk Operating System compatible with MS-DOS (and FreeDOS) wrote in assembly language and you can run programs and scripts for MS-DOS.
Micro-80 aims to simulate a Z80 homebrew computer down to the bare metal: 64K RAM, ADM-3A terminal, parallel port, serial port and...3.5" 1.44MB floppy drive?!1 weekly downloads
KittyOS is a small operating system based on Linux. The OS is for USB pendrives and old computers. It uses XFce graphical enviroment.
Run Linux on the Playstation 2213 weekly downloads
Xinu x86 port written in c, and assembler, porting a pdp-11 operating system to the intel x86 architecture. Need's lot's of support, and a total rewrite on it's memory manager module.
A small operating system primarily made for learning operating concepts and designs.
A toy operating system built in C++ and x86 assembly.
16 bit operating system written in NASM.
vMac is a free Open Source Macintosh emulator that is available for Linux/X-Windows, Win32, DOS, MacOS, and more.
A advanced graphical operating system.
Project has been move to https://github.com/ciaa/Firmware20 weekly downloads
ANBU is an Open Source operating system combining what we like about Unix with new and interesting ideas.
Neptune is a kernel and operating system for x86 PCs.
Simple, Fast, Advanced... ZintoriOS. Made in Wellington, New Zealand
Flip OS is a open source OS based off of ReactOS. We write the code using the ROS Code as a guide.
New Linux Based OS primarily for smart devices and PDA's, laptops, and eventually desktops. It offers an alternative to the "embedded" approach. All OS versions and applications will be hosted and then made available to the subscribers of cloud svs
A scheme (lisp) interpreter written in ARM assembly language (ARM7TDMI, ARM920T, Cortex-M3) for education, robotics, wearable devices. Tested on NXP LPC-1300,1700,2000, ATMEL AT91SAM7, STM STR711, STR911, STM32, CIRRUS EP9302, LMI LM3S1968, TI OMAP.15 weekly downloads
Occam aims to be an extensible, distributed, object-oriented, and secure operating system. It is currently in the planning stages.
An open source OS written in assembly.
A rudimentary PC kernel with text I/O (doesnt work)4 weekly downloads