An operating system based on the best Windows NT design principles
ReactOS is an open source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft Windows NT family of operating systems (NT4, 2000, XP, 2003).
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.
Free operating system for Atari computers, and more.
EmuTOS is a TOS compatible operating system for Atari ST series computers, and more. It is made from Digital Research's GPLed original sources and is a free and open source alternative to Atari proprietary ROMs.
Generic SCSI target subsystem for Linux SCST allows creation of sophisticated storage devices. It includes generic SCSI target core with SCSI target drivers and backend handlers. There are target drivers for iSCSI, Fibre Channel, SRP, SAS, FCoE, etc.
Tool kit for building highly secure special-purpose operating systems
The Genode OS Framework is a tool kit for building highly secure special-purpose operating systems. It scales from embedded systems with as little as 4 MB of memory to highly dynamic general-purpose workloads. Genode is based on a recursive system structure. Each program runs in a dedicated sandbox and gets granted only those access rights and resources that are needed for its specific purpose. Programs can create and manage sub-sandboxes out of their own resources, thereby forming hierarchies where policies can be applied at each level. The framework provides mechanisms to let programs communicate with each other and trade their resources, but only in strictly-defined manners. Thanks to this rigid regime, the attack surface of security-critical functions can be reduced by orders of magnitude compared to contemporary operating systems.
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.
FlashForth is a standalone Forth system for the Microchip PIC 18, 24, 30, 33 and the Atmel Atmega series of microcontrollers. A Forth system with interpreter, compiler, assembler and multitasker is provided.
freeRTOS for Arduino Uno, Goldilocks 1284p & Mega 2560
AVR ATmega port of freeRTOS A port of freeRTOS which can be flexibly flexibly configured use almost any available Timer on AVR ATmega devices and will operate with almost any classic Arduino device from Arduino, SeeedStudio, Sparkfun, Freetronics or Pololu. Going forward this repository will be updated less often and only with major releases. Please check at Github for the latest commits. https://github.com/feilipu/avrfreertos The Goldilocks Analogue story is told here. http://feilipu.me/?s=Goldilocks+Analogue The Goldilocks 1284p story is here. http://feilipu.me/2013/03/08/goldilocks-1284p-arduino-uno-clone/ If this repository is too complicated to get started, a minimum AVR freeRTOS configured using the Watchdog Timer and Heap 3 is also also available. https://github.com/feilipu/miniAVRfreeRTOS For the Arduino platform there is a freeRTOS Library available in the Arduino IDE Library manager. https://github.com/feilipu/Arduino_FreeRTOS_Library
colorForth is, in Chuck Moore's own words: "A dialect of Forth that uses color to replace punctuation. Includes its own operating system. Produces extremely compact programs. Instant compile from pre-parsed source."
Perix is a 16/32 protected mode kernel, bootable and capable of running without an operating system. It is written in Turbo Pascal 7.0 for DOS, Delphi 7.0, Pascal Pro, Virtual Pascal v2.1, TASM and JWASM. Turbo pascal version can be used as kernel on its own, or as a second stage loader to external programs. I would like to announce, that the first attempt to put the Delphi 64bit to work was successful. As soon as possible I will place at the disposal a very small 64bit kernel version.
FreeMiNT is a free alternative OS kernel for Atari systems & clones
FreeMiNT provides the basis of a free TOS compatible replacement OS that can multitask. Used together with the free system components fVDI (device drivers), XaAES (graphical user interface widgets), and TeraDesk (desktop manager), it provides a modern user interface.
Small real time operating system for AVR and ARM microcontrollers
AvRtos is a small, preemtive, priority based real time operating system for Atmel AVR and ARM microcontrollers. It was written in C. AvRtos provides message queues and semaphores for task synchronization. It uses a static memory allocation scheme. AvRtos is nearly the smallest RTOS out there. Even pico]OS is much bigger. AvRtos can be compiled using gcc compiler. There is a AvrStudio 4 and Eclipse project file to get the example code working very quickly.
An operating system written in RTL
The Controlix operating system is written in RTL and is designed to be modular, synchronous, distributed, verifiable and retargetable.
Rewrite Minix 3 from C to D
The idea is to rewrite a good part of the Minix 3 OS from C to D, hopefully making the code easier to understand by grouping code in modules. Minix 3 web site: http://minix3.org/ D programming language: http://www.digitalmars.com/d/
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.
HAL for STMicroelectronics SPC5xx microcontrollers.
The SPC5-HAL project implements an Hardware Abstraction Layer derived from the HAL of the ChibiOS/RT project. This derived HAL does not call an operating system directly but defines a customizable abstraction layer (SPC5-OSAL). This mean that SPC5-HAL can be used also without an operating system.
An operating system for tenputer
C++ embedded RTOS,TCP/IP,TLS,FAT,USB,PERIPHERALS,...
Aim of embKernel is to produce an unified C++ source for embedded devices (cortex-M uC for the time being) which includes: -RTOS -TCP/IP stack -TLS (Work in progress) -FAT32 file system -USB stack -Drivers for common uControllers peripherals See the wiki pages for more information.
open source analogue of IBM OS/2 operating system
replicated-kernel Linux-based OS
The Popcorn Linux project is exploring how to design operating system for future multi- and many-core hardware platforms, that can be Instruction Set Architecture (ISA)-diverse, based on the Linux kernel.