Free RTOS List

From my research for Insiders' Guide: Selecting an Embedded RTOS, here is a quick list of non-Linux 'Free' RTOSes available on the Internet:

avr-rtos - A Real-Time Operating System kernel for the Atmel AVR microcontroller, incorporating tasks, memory management, semaphores, queues, and other features
AvrX Real Time Kernel - AvrX is a Real Time Multitasking Kernel written for the Atmel AVR series of micro controllers. AvrX contains approximately 40 API in the following Six categories: Tasking * Semaphores * Timer Management * Message Queues * Single Step Debugging support * Byte FIFO support with synchronization. The Kernel is written in assembly. Total kernel size varies from ~500 to 700 words depending upon which version is being used.
C Kernel - The C Kernel is a real-time preemptive kernel specially written for embedded applications running on various micro controller environments. Supports x86, 8051, C166, ZiLOG, Fujitsu F2MC-16 Since The C Kernel is written in C it is easy to make new bindings (ports) to other compilers and micro controllers or processors. GNU Lesser GPL License.
CapROS: The Capability-based Reliable Operating System - CapROS is a new operating system for the x86 architecture that merges some very old ideas about capabilities with some newer ideas about performance and resource management. The result is a small, secure, real-time operating system that provides orthogonal persistence. CapROS is an experimental capability-based operating system, for the Intel architecture, based on EROS, KeyKOS, and Gnosis.
Chimera Real-Time Operating System - A next generation multiprocessor real-time operating system (RTOS) designed especially to support the development of dynamically reconfigurable software for robotic and automation systems. Chimera is a VMEbus-based operating system which supports multiple general and special purpose processors. General purpose processors come in the form of single-board-computers (currently MC680x0 family of processors supported) which we call Real-Time...
Coyotos Secure Operating System - Coyotos is a secure, microkernel-based operating system that builds on the ideas and experiences of the EROS project. Much of the code developed for EROS will migrate directly to Coyotos. Coyotos is being developed on AMD-64 and Pentium platforms. Once we have a baseline kernel working, we would welcome help getting it running on PowerPC as well.
CubTrix - Real-time Kernel - CubTrix is a graphical user interface with support for real-time applications. Built on top of a small, fast and efficient real-time microkernel. Download CubTrix a Cubical Real-Time Kernel Project Admins: pettersson Operating System: (None Listed) License: BSD License Category: Operating System Kernels
E.R.I.K.A. (ERIKA) - Open Source RTOS for Automotive - ERIKA Educational is a a full-fledged and fully functional RTOS distributed under the GNU GPL license. It has been designed to be an effective and attractive Educational platform for real-time programming or embedded systems courses. A first possibility for students and instructors is to use ERIKA educational as a programming environment to develop small control applications. Supports Hitachi H8/300.
eCos home page - Open source, royalty-free, real-time operating system intended for embedded applications. The highly configurable nature of eCos allows the operating system to be customised to precise application requirements, delivering the best possible run-time performance and an optimised hardware resource footprint. Supports ARM, Xscale, Renesas H8, x86, 68K, MIPS, PowerPC, Sparc, SuperH, and many others.
Fiasco - Fiasco is a preemptible real-time kernel supporting hard priorities. It uses non-blocking synchronization for its kernel objects. This guarantees priority inheritance and makes sure that runnable high-priority processes never block waiting for lower-priority processes. Supports x86 architecture.
Free Dos - The goal of the FreeDOS Project is to create a completely FREE MS-DOS(tm) compatible operating system. FreeDOS will run on all DOS capable platforms, from XT's to Pentium Pro's.
FreeRTOS - Realtime Scheduler - Portable, open source, mini Real Time Kernel - a free to download and royalty free RTOS that can be used in commercial applications. FreeRTOS is licensed under a modified GPL and can be used in commercial applications under this license. (Supports ARM Cortex-M3, ARM7, ARM9, HCS12, H8S, MSP430, Microblaze, Coldfire, AVR, x86, 8051, PIC24 & dsPIC.)
Hartik - The HArd Real TIme Kernel - HARTIK is a hard real-time kernel designed to help the development of real-time applications, ranging from critical control systems to soft multimedia, distributed systems. It was developed at the RETIS Lab as a research project to explore the applicability of real-time theory to real world applications. HARTIK Applications: Monitoring and control systems, Advanced robotics, Multimedia applications, Scheduling Simulator.
IVMUK RTOS - Basic OS for small MCU's. Supports Microchip's PIC18F252 chip.
Katix project - Katix real time operating system (Katix RTOS) and Katix Embedded Linux (Black Cat Linux). Katix Embedded Linux distribution is available for Motorola MPC5200 microprocessor family.
L4 ľ-Kernel Family - Originally, L4 is the name of a second-generation ľ-kernel (microkernel) designed and implemented by Jochen Liedtke, running on i486 and Pentium CPUs. However, there are now numerous implementations of the L4 API (application programming interface) on several hardware architectures.
L4Ka::Pistachio RTOS - Vision is a microkernel technology that can be and is used advantageously for constructing any general or customized operating system including pervasive systems, deep-computing systems, and huge servers. Supports Alpha (21164, 21264) AMD64 (Opteron 242, Simics) ARM (SA1100, XScale, ARM925T) IA32 (Pentium and higher) IA64 (Itanium1, Itanium2, Ski) MIPS 64bit (R4000, R5000) PowerPC 32bit (IBM 750) PowerPC 64bit (Power3, Power4).
MaRTE OS - Minimal Real-Time Operating System for Embedded Applications - MaRTE OS is a real-time kernel for embedded applications that follows the Minimal Real-Time POSIX.13 subset. Most of its code is written in Ada with some C and assembler parts. It allows software cross-development of Ada and C applications using the GNU compilers Gnat and Gcc. Supports x86.
Maruti Project, University of Maryland - Maruti 3.0 is an embeddable hard real-time runtime system for distributed and single-node systems. Also includes a development environment. Not updated since 1996.
MenuetOS - Hobby Operating System for the PC written entirely in 64bit assembly language, and released under License. It supports 64 and 32 bit x86 assembly programming for smaller, faster and less resource hungry applications. Menuet has no roots within unix or the posix standards, nor is it based on any particular operating system. The design goal has been to remove the extra layers between different parts of an OS, which normally complicates...
NicheTask 'Free' RTOS - The royalty-free 'C' source code is being made freely available to all device developers. Key Features: ANSI 'C' Source Code. Low memory footprint Portable to any CPU Network protocol stacks available from InterNiche Easy to upgrade to a preemptive RTOS without adding overhead Supports simple migration from one RTOS to another Multiple tasks, limited only by memory availability. Sponsored by InterNiche.
Open Ravenscar Real-Time Kernel - Open-source real-time kernel of reduced size and complexity, wich can be used to develop high-integrity real-time applications in a subset of the Ada 95 language compatible with the Ravenscar Profile. The Ravenscar Profile defines a subset of the Ada tasking features which can be implemented using a small reliable kernel. Supports x86 and SPARC.
Openmoko - Integrated Open Source Mobile Communications Platform - OpenMoko is an attempt to create the world's first completely open mobile phone software stack. The OpenMoko Wiki is our centralized, collaborative effort to collect and maintain all kinds of information and documentation on the OpenMoko software platform as well as the supported devices (Neo1973).
openOSEK - Q: What is openOSEK? A: openOSEK is an open source and cross-platform operating system framework, which aims for full conformance with the OSEK/VDX(TM) derived specification (ISO 17356). Q: Why OSEK? A: Clearly there are some excellent open source RTOS alternatives (FreeRTOS, eCos, Jaluna, etc). The problem with these operating systems, from an automotive perspective, is: Most of these alternatives are quite bulky and their real-time...
OS Kit - The OSKit is a framework and a set of 31 component libraries oriented to operating systems, together with extensive documentation. The OSKit's goal is to lower the barrier to entry to OS R&D and to lower its costs. The OSKit makes it vastly easier to create a new OS, port an existing OS to the x86.
Phoenix-RTOS - Phoenix-RTOS is the realtime operating system intended for embedded systems. The main goal of the Phoenix-RTOS project is to develop free, portable, small and well-designed realtime operating system for embedded hardware platforms like SBC (Single Board Computers), SOM (System on Module) and SoC (System On Chip). Support for ˇ IA32 ˇ PowerPC ˇ ARM
pico]OS - pico]OS is a highly configurable and very fast real time operating system (RTOS). It targets a wide range of architectures, from very small 8 bit processors and microcontrollers up to very huge platforms. Ports are available for 6502, 80x86, PPC and AVR.
PICOS18 - Operating Systems for PIC Microcontrollers - This web site presents PICOS18, an operating system based on OSEK/VDX, an open industry standard. The OSEK standard is well suited for the low computing, power, small memory embedded controllers used in automotive or robotique applications. PICOS18 designed by Pragmatec Inc. is an operating system for the PICmicro microcontrollers from the Microchip PIC18xxx family. It is totaly free and is distributed under the GPL licence.
PORTOS - Real Time Operating System - PORTOS is a new kind of RTOS based on the concepts of priority functions and priority objects. The main goal behind PORTOS is to simplify the programming of embedded systems, to enable cleaner designs, and to improve performance. PORTOS is essentially a library of routines that can be either used stand-alone or integrated in any existing Real Time Operating System. A license is required for any commercial use.
Prex project - The Prex project is an open source initiative to provide a portable real-time operating system for embedded systems. This project originally started to make a royalty-free OS for mobile phones and PDA in order to spread open source movement to such proprietary OS fields. And now, the project target has been shifted to the wider area of real-time and embedded systems. Prex is designed specifically for small memory footprint platforms. It...
proc Real-Time Kernel - Produces FREE proc Real-Time Kernel: Compact and RTOS for embedded systems. Also for DOS. proc runs on several different architectures. Source included. Other products include The Message Router, NMX Message Exchange and the nemon Boot Monitor. Supported architectures: x86 / PC 68HC11, (also banked) H8, (8 and 16 bits) 68k / 6833x ColdFire 80C196 C167 AVR i960Jx MSP430 Z180
RDOS Operating System - RDOS Operating System License RDOS source code is distributed as GPL, except for commercial usage in embedded systems. * Serial Network Protocol for embedded systems. FREE only for non-commercial use. Commercial use requires a LICENSE. Supports x86.
RTEMS - The Real-Time Executive for Multiprocessor Systems - Commercial grade RTOS designed for deeply embedded systems. It is a free open source solution (GPL) that supports multi-processor systems. RTEMS is designed to support applications with the most stringent real-time requirements while being compatible with open standards. Development hosts include both MS-Windows and Unix (GNU/Linux, FreeBSD, Solaris, MacOS X, etc.) platforms. Supports ARM, TI DSPs, Renesas, x86, i960, 68K, MIPS, PowerPC, SPARC.
rtmk - real-time microkernel - rtmk is free real-time microkernel developed by Johan Rydberg. It shared alot of ideas with the Mach microkernel developed by CMU in the late 80's and early 90's (project stopped in -94).
RTOS UH: Real-Time Operating System for Process Automation - Programming system PEARL RTOS-UH was designed for the special requirements found in process automation and automatic control and is based on the processor families MC 68xxx, MC 683xx as well as on the PowerPC. RTOS-UH offers the same programming and real-time environment regardless which hardware is used - from the smallest single board MC 68008 up to the high-end PowerPC 604 VME-bus system.
S.Ha.R.K. (Soft Hard Real-Time Kernel) - S.Ha.R.K. is a dynamic configurable kernel architecture designed for supporting hard, soft, and non real-time applications with interchangeable scheduling algorithms. The kernel is fully modular in terms of scheduling policies, aperiodic servers, and concurrency control protocols, which typically are not modular in traditional operating systems.
Scout Operating System - Scout is a communication-oriented operating system targeted at network appliances (e.g., network-attached devices, set-top boxes, hand-held devices, and so on). Scout currently runs stand-alone on Digital Alpha and Intel Pentium processors. It is hosted from Linux using GNU tools. Scout includes source code derived from GNU libraries, Linux device drivers, Bellcore's MGR window manager, and the x-kernel.
T-Engine Project - T-Engine is a new standardized development platform into which the eTRON architecture has been installed. The eTRON architecture enables the secure transfer of information and rights through insecure network channels such as the Internet. By using the T-Engine platform, network devices such as mobile phones, portable devices, and information devices can be efficiently developed. Source code available for download.
The Contiki Operating System - Contiki is an open source, highly portable, networked, multi-tasking operating system for memory-constrained systems. Contiki runs on a variety of tiny systems. Supports MSP430, x86, AVR, and various old computer formats. Code footprint is on the order of kilobytes and memory usage can be configured to be as low as tens of bytes.
The ROME Operating System - ROME is a lightweight, modular, multitasking, embedded operating system which has been developed and used for multiple research projects within the Computer & Communications Research Laboratory (CCRL) of NEC USA, Inc. in Princeton, NJ. ROME OS has been released under the GNU General Public License (GPL). Supports Intel x86, i960, and MIPS r4000.
TinyOS - TinyOS is an open-source operating system designed for wireless embedded sensor networks. It features a component-based architecture which enables rapid innovation and implementation while minimizing code size as required by the severe memory constraints inherent in sensor networks.
TNKernel RTOS - Compact and very fast real-time kernel for embedded 32/16 bits microprocessors. TNKernel performs preemptive priority-based scheduling with round-robin scheduling ability for tasks with identical priority. Current version of TNKernel includes semaphores, mutexes, data queues, event flags and fixed-sized memory pool operation. System's functions calls in interrupts are supported. Supports ARM architecture. FreeBSD-like license.
USIX Operating System - The USIX Operating System is designed to provide source and binary compatibility with SVR4/386 while offering guaranteed response time to interrupts in real-time applications, multiprocessor kernel architecture, better resource utilization, a more robust file system and the ability to dynamically extend the kernel without re-linking.
uSmartX RTOS - Non-preemptive, multitasking, priority based RTOS. It features necessary mechanisms for inter-task communication and basic task and time control functions. uSmartX is targeted for small foot-print embedded designs. Being a non-preemptive kernel it consumes little memory and it is very simple to use. Supports ARM, AVR, Renesas H8-300H.
WhatOS (RTOS Creation Tool) - WhatOS is a free open source embedded system development solution. It provides a complete set of tools for creating high-quality, reliable embedded systems. These include: a real-time operating system (RTOS) generator, a simulator for testing and debugging generated systems, and tools for interacting with systems remotely after they have been embedded.
XMK - eXtreme Minimal Kernel - XMK is a preemptive multi-tasking kernel for 8bit microcontrollers. Its goal is to provide a bare bones RTOS with a small enough footprint (RAM+ROM) to run on 8bit microcontrollers. Open Source RTOS for 8Bit microcontrollers - Including Hitachi H8 and Atmel's AVR chips.
Xoberon: Hard Real-Time Operating System for Mechatronics - XOberon/PowerPC is a hard real-time operating system (HRTOS), deployed for high-end mechatronic products control. It has been developed at the Institute of Robotics, Swiss Federal Institute of Technology, Zurich. XOberon is loosely based on the Oberon System, and it is written in the Oberon-2 programming language.