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SD is a new operating system developed in the Pascal language (FreePascal, FPC/FPK) and NASM for IA-32. It's main purpose is to provide a fast and simple 32-bit multitasking OS. The OS must have several DOS, Windows and Linux features and maybe Win32 emu.
Ingenix is a novel approach to distributed computing and is an exiting attempt to alter the Operating Systems landscape that hasn't really changed much in over 30 years. It is based on an exokernel architecture and written from scratch.
Mithrill is an exprerimental microkerenl based operating system. Out initial interest will be in the research of persistant and distributed systems, and security techniques on top of a microkernel.
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Seed is probably best thought of as an single-address-space, linear-object-based, native, persistent operating system with event-based pre-emptive-multitasking, but without anything resembling a traditional kernel or filesystem.
JimpOS - Java Implemented Operating System
The main purpose of the JimpOS project is realisation of multitasking, platform independent operating system written in Java language.
GenesisAE defines and implements an application environment for portable, network-transparent and secure applications. GenesisAE is based on a QNX-like (S/R/R) microkernel and on basic servers (providing device I/O, a database, ...)
MenuetOS is a fully 32 bit assembly written graphical operating system. Menuet supports 32 bit x86 assembly programming as a faster and smaller system footprint.
Menuet has no unix roots and the basic system is meant to be a clean asm based structure.
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The kernel janitor project maintains a list of problem areas in the Linux kernel along with suggested ways of cleaning/fixing them. Please see http://www.kerneljanitors.org/ for current information.
Horizon is a research project aimed at developing a 32-bit Operating System for the Intel architecture. It's written in C and assembler (GAS syntax) and one of its main characteristics is full network integration.
JSPowerLin - Linux with a Java edge, a lightweight platform for developing and deploying J2EE applications and Java Server Pages on a server or servercluster.
Hadie - Hardware Abstracting Device Independent Environment. Or just another micro kernel for embedded devices.
Supported architecture are i8051 (80515c), i166 (XC161CJ), Tricore (TC1775B), m68k (m68332) and i386.
Urinel is a dynamic kernel-less operating system designed for maximum code reuse. This improves the efficiency and stability of the code and reduces the size of applications allowing a wide range of functionality to applications.
A simple operating system made for educational purposes. It will be a 32 bit multitasking open source operating system. Latest release covers interrupt handling, device drivers and shell service.
The goal of this project is to develop an Operating System. It will have a NTFS style file system and use a Windows XP compatable hardware driver system. The main focus is to allow common executable formats (windows/unix/ELF).
The Fecundity Project has the purpose of creating a streamlined AMD64 based Operating System. We will hopefully create a stable and secure operating environment, and to investigate orthogonal persistence.
AcOS is an acronym for Assembly Constructed Operating System.
As the name suggests AcOS is written in the assembly programming language and written for the Intel i386+ and compatible range of processors.
Still in early development
A Unix-like (Not compleatly Unix-compatible) Kernel. Right now, we have (very limited support) of 80486+ IBM-PC AT compatibles. Written in C, and assembly. No network support planned for the forseeable future.
kissme is a free (GPLed) Java Virtual Machine. It is being developed on GNU/Linux and can run console java applications. kissme is to be used with the GNU Classpath java class library. kissme also provides support for orthogonally persistent java.
Minerva's primary goal is security. To allow all users to feel safe and secure but have the freedom to do what ever they want. We also want a fast easy way to bring every linux and windows o/s together.
Fast, multi-threaded OS for PCs and 386+ based embedded systems. Runs many DOS, DPMI and Win32 console programs. 100% assembly with segment protection.
WISDOM is a 32-bit operating system with a primitive shell implemented. It is copyrighted under GNU/GPL license. WISDOM is also a research into the field of design of operating system. Operating System Development has been in the shadow in recent times.