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.
A Simple 'IDE'A for Linux Kernel Developers
LinK+ IDE is a simple IDE for Linux Kernel Developers and Lovers. It is based on Eclipse IDE customized for Linux kernel programming. It reduces the development time and executes code in an elegant fashion. This IDE supports Linux kernel configuration, compilation & emulation, system call development and device driver development. LinK+ IDE includes various templates in the category of character, block and network device driver subsystems for device driver development. It includes various bus infrastructure templates and also provides Linux device driver code completion, code assistance & code navigation for developers. Download - LinK+ IDE for 32 & 64-bit architecture : https://sourceforge.net/projects/linkplustest/files/installers/ LinK+ Update Site (compatible with Eclipse IDE v3.6.x ): http://sourceforge.net/projects/linkplustest/files/repository/ User Manual: http://sourceforge.net/projects/linkplustest/files/documentation/LinK%2B_UserManual_Rev4.pdf
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.
Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.
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
Nucleus is an Operating system Kernel that is totally different from Linux and Windows. It is easy to understand and implement. It will have native support, small architecture and full VGA support (no text mode).
Embedded Operating System
EXIRION/OS is an operating system for embedded computer systems. These operating systems are designed to be compact, efficient at resource usage, and reliable, forsaking many functions that non-embedded computer operating systems provide, and which may not be used by the specialized applications they run. They are frequently also referred to as real-time operating systems, and the term RTOS is often used as a synonym for embedded operating system. EXIRION/OS project, a Open operating system for computers that can be used in specific operations that require execute a task at a time, EXIRION/OS operating system is a monolithic and mono layered task, which can be used to control complex electronic equipment without the use of instruments PLC, offering a wide range of electronic and industrial applications, EXIRION/OS is also an educational tool, it is an open source operating system to use it as an example of building operating systems in universities and technical colleges.
Real-time, modular, microkernel-based operating system under development for i386. The first goal is to support 32-bit DOS protected mode applications made with DJGPP as well as native applications.
The OpenSSI project is a comprehensive clustering solution offering a full, highly available SSI environment for Linux. Goals for OpenSSI Clusters include availability, scalability and manageability, built from standard servers.
With this project I intend to write a really, really simple OS, just for fun and learning. I think I will never have a really usable version, as I said, that's no my objective.
uSmartx is a non-preemptive, multitasking, priority based kernel for use in embedded designs. Its major features are task and time control over system resources, inter task communication and simple memory management.
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]
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.
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.
IBOX is a "modular" operating system for the X86 desktop. The main goals of this os are: Portability, Stability, Security, and Customizability.
An open source operating system for x86.
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 use
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.
This project aims to develop a Lisp based operating system for general purpose computer architectures.
Caracal Boot Loader (cboot) is a second stage boot loader which takes over from GRUB (or other multiboot compatible loader) and prepares the system for your higher-half kernel. It now also includes VESA mode setting support.
Jazmyn is a 32-bit, Protected mode, Multitasking OS which runs on i386 CPU`s. Its completely written in C++ & a bit of 8086 assembly. Jazmyn has 4 major parts of an OS : Process management,Memory management, Device management & File system driver.
The aim of this project is to develop a modular operating system for the i386 architecture, where each device driver, file system, etc, will be a module that can be loaded and unloaded at run-time from the system.