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Gebix is a FreeBSD-based operating system that will be available for both x86 and ARM as of version 0.7 Release Candidate 1. It will sacrifice most of the legacy support to transition to new or recent alternatives.7 weekly downloads
NandOS ist ein Betriebsystem.2 weekly downloads
XSystem Kernel Project - an object-oriented 32-bit protected-mode operating system for IA32-architecture.1 weekly downloads
A Debug style tool for OS Free systems1 weekly downloads
The project aim to create a microkernel-based operating system from scratch.1 weekly downloads
A special-purpose 4.4BSD-based UNIX-like operating system, designed for machine control applications. Using low-cost hardware, FabBSD can be used to control a wide array of CNC milling machines, lathes, routers, process-control and automation equipment.1 weekly downloads
RODOS is a real-time embedded operating system, designed for applications demanding high dependability. The system was developed in C++, using an object-oriented framework simple enough to be understood and applied in several application domains.1 weekly downloads
The Trion Object Oriented Operating system is an OS that is designed to meet the needs for the 21st century, with a kernel written in C++ and modelled in UML, and lots of features. The project is run by a team of OSDev.org community members.1 weekly downloads
Hobbyist operating system using a new microkernel. The objective is to not get bogged down by ancient legacy processor support. The OS is meant to be designed from the ground up, without utilizing any legacy or existing implementations or designs.
A FOSS operating system that aims to meet NSA's TPEP TCB A1 evaluation standard while retaining application compatibility at minimal performance overhead.
Our project focuses the development of an operating system with a most simple implementation and structure. The goal is to provide a good starting point for beginners along with accompanying documents.
RedBrick project tries to bring the best commonly available open source software pieces like linux 2.6, lustre, sleepycat, mysql, tipc,openais and others available in the above paradigms together as a integrated single downloadable cluster image. T
Turtle OS is an Unix-like OS. It aims to be open source, secure, high performing and portable.
cyOS is a virtual operating system, designed to run in any modern web browser.
open source analogue of IBM OS/2 operating system