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FreeOS/1 is a Free, Open Source, FreeDOS based Free and Open Source Alternative OS, with open source Microsoft Windows compatibility using HXDOSExtender KernelEx,and ReactOS source code. FreeOS/1 will include new technologies and will be easy to use15 weekly downloads
uGNU/RTOS (literally "micro G'Noo RTOS") is an Open Source serial Real Time OS for microcontrollers (PIC, ATMEL).2 weekly downloads
BLibrestez Robotics Software Library Project1 weekly downloads
Overnet Millennium Server for Unix Linux1 weekly downloads
An ASCII MMORPG / World Simulation / Genetic Programming Project1 weekly downloads
OSNOS (Open Source Network Operating System) is an operating system desigend to meet the needs of small to medium networks. It will support server based applications, and will handle routing of packets through the network, and support multi-user logins.1 weekly downloads
Ryu/x86 OS is more or less an OS kernel, drivers, and shell for the x86 (386+) architecture. Written mostly in C and assembly, it is targeted at OS enthusiasts who wish to have a simple framework on which to build larger, more functional OSes.1 weekly downloads
I have developed and tested a small 32-bits Kernel running on i386. I want to share it to this developers community. The kernel is developed in Assebly Language and it have bootloader, multitask, etc, etc...1 weekly downloads
Tesoro is an open source operating system project fully written in x86 Assembler language. The architecture is partially based on some QNX ideas and some fresh ideas. It combines low level assembler coding (e.g. microkernel with extremely fast task switch1 weekly downloads
operatating system kernel in C1 weekly downloads
This project is an SO with a bootloader, a kernel, and posiblely modules1 weekly downloads
Cellocity Linux is Based on Fedora Core 6 Source Code. With only basic core elements needed to operate Compatipal and a completley Graphic Interface as well as Text. Version 2.0 will include more applications 32,64 bit and 80 Core Intel CPU
FOSX is a OS. To create a real working Operating System is our purpose. Maybe it is a very small and simple OS, but we are trying our best to make it complete. It contains all the basis modules. Kernel, MM, FS, Processor Scheduling and etc.
FreeDOS-64 is 64-bit Disk Operating System under development for the AMD64 platform.
Genesix is a kernel for the x86 (386+) architecture. Written mostly in C and assembly, it is targeted to learning kernel architecture and development essentials.
The Isis OS Project Is a Controlled Project to Develop An Advanced Modern Operating System!
Learn, Adapt, Store, Evolve, and Retrieve
MightyOS is a serious attempt at making a fast and lightweight Operating System written in C++.
Knuth NNIX operating system kernel
Occam aims to be an extensible, distributed, object-oriented, and secure operating system. It is currently in the planning stages.
Simple OS written in Asm(x86[-64]) / C.
Plex OS is an open source IA32 operating system
The kernel of dbro os
A security oriented operating system, called WARBIRD(under development).
StrikeRange Appliance platform.