Open Source Server Operating Systems Operating System Kernels

Contiki is an open source, highly portable, networked, multi-tasking operating system for memory-constrained systems. Contiki current source code: https://github.com/contiki-os/contiki Contiki historical source code: https://github.com/adamdunkels/contiki-1.x

ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.

7-max increases the performance of some applications up to 10-20%. Windows uses small (4 KB) RAM pages by default. 7-max allows to use large (2 MB) RAM pages.

Cooperative Linux is the first method for optimally running Linux on Windows and other operating systems natively. It is a port of the Linux kernel and support code that allows it to run cooperatively without emulation along with another operating system.

Syllable Desktop is a complete operating system that is easy to use, powerful, lightweight and extraordinarily fast and responsive. It has its own kernel, filesystem, GUI and applications. Syllable Server is a matching small and efficient Linux server.

This project reimplements from scratch the RPL language made popular by HP programmable calculators, in portable C/C++. The main goal is to release a complete computing environment for various targets. There's currently 4 active targets: the HP 50g, HP39gs and HP40gs calculators and a PC simulator (see the downloads section!). Other ports are planned for the future.

Open Source SW/HW Project for Embedded Ethernet Applications. Works with AVR ATmega256/128/103, AVR32, SAM7X, SAM7S(E), SAM9, AT91X40, GameBoy Advance, Cortex M3 / M4 (STM32, NXP LPC, LM3S), Freescale Coldfire, RTL8019AS, LAN91C111, CS8900 and DM9000E chips. Offers a tiny TCP/IP stack including HTTP, FTP and DHCP.

JNode is a Java New Operating system Design Effort. JNode is a simple to use and install Java operating system for personal use on modern devices. Any java application runs on it, fast and safe. See our homepage for additional information.

Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.

A Linux operating system, designed and developed to be beautiful, simple, fast, and stable on many computer hardware.

UUMATE is a respin of Ubuntu Mate (https://ubuntu-mate.org/) The main goal of this project is simple: Just have an updated Ubuntu Mate 64bit ready to install, with full multimedia support, compiz, many extra applications and some cosmetic changes. Many PPAs/Repos already available. Event sounds (minimize, maximize, close, etc...) enabled by default you can enable/disable compiz using "mate-tweak"! No need to download hundred megabytes after installation! Note: To burn the ISO to a USB stick, use "dd" command. In MS Windows use Rufus. This ISO is helpful for people trying to install linux for the first time or coming from windows environment. It has plenty of software pre installed (some are trial/shareware) with full internet and multimedia support. Very useful as live media as well. It has audio/video codecs, flashplayer, java, googletalk, telegram, twitter, etc... Changelog: http://sourceforge.net/p/uumate/blog

Our mission is to explore and develop new operating system concepts; to redefine the architecture while using assembly language for most of the underlying architecture.

TempleOS is a 64-bit kernel with compiler, graphics library and tools. It is not a Unix. It was made from scratch.

Provide secure and stable OS, based on highly modified Linux Kernel, own package system, like "BSD Ports". Compatible with x86, Power PC. Easy to use of any level users. Complete Documentantion in many languages. 99% compatible with Windows.

Native Oberon Operating System

TomOS is a simple 16 bit operating system for x86. It is based on MikeOS version 2.0.0. It is entirely written in the assembly language. TomOS is an educational project.

ELKS is a subset of the Linux kernel that runs on IBM compatible PCs from 8086 up. It is intended to get use out of obsolete old hardware, for use in embedded systems, and as an educational tool. ELKS has been moved to Github to protest SourceForge's installer adware hijacking. This does not directly affect ELKS, but it does affect many major open source projects such as Gimp and FileZilla by attempting to trick the user into installing adware in order to download these programs. I refuse to leave ELKS here with such policies in effect. If you have questions about this, please email jody@c02ware.com.

Fireball (FSD) Amoeba is a distributed operating system. It collects a huge varity of single machines connected over a (fast) network to one, huge computer.It's a full Operating System Distribution. Based on Amoeba,Vrije Universiteit.

HamserOS is our attempt to build a cute and furry operating system from scratch. Just for fun and a love of hamsters.

A multitasking, multithreaded operating system designed for SMP systems and developed based on the X/Open Single Unix Specifications Version 3.0.

Clicker is a project for a Multitasking Open-source operating system written from scratch. based on a modular micro kernel. We want to explore new way of designing and using OSes :) [newz: PCI, NE2K and VBE]

Currently ManuOS kernel is under development. Once kernel is complete, a good Graphical User Interface will be developed for ManuOS. ManuOS runs on IA-32, x86-64 and currently operates in protected mode. In future ManuOS is intended to run in long mode.

NuDawn started as an OS/2 emulation for WINE and now has new direction to be an open source operating system supporting legacy hardware that the OEM no longer supports. NuDawn is a green OS, hence keeping your electronics out of the landfill.

OpenCom is an open-source component programming model designed by the School of Computing and Communications at Lancaster University, UK. This project maintains the official C language version of OpenCom.

Public Domain Operating System (currently x86 and 80386 and S/370 and S/390). Note that latest source code is here in git, but latest executables and packaged source are at http://pdos.org