Realtime preemptive kernel coded fully in C, so is highly portable to different hardware platforms and easily embeddable; Descriptions, full source code, examples, C Style Guide and programming Guidelines. [Free] http://home.hetnet.nl/~p_vd_vlugt/
RTOS, no royalty, tightly integrated RTCS TCP/IP network stacks, many communication and networking protocols; suite of components, tools for embedded use, device drivers, software-development tools. http://www.psti.com/products/mqx/
A RTOS for high safety systems, brick-wall time, space partitioning of separate loaded programs with different levels of criticality, for greatly reduced test, certification costs, compliant to ARINC653 open system interface definition. By BAE Systems Nor http://platformsolutions.na.baesystems.com:8080/CsLeos/
Environment for uC/OS-II RTOS on Win32 platform; has 2 main modules, run as normal programs: module 1 (WCOS) runs RTOS with embedded program, module 2 (WSim) has functions to run and control full simulation with any hardware platform. http://wsim.pc.cz/abstract.php
Priority-based, preemptive multitasking OS for Z80/Z180, written in TML2 and Z80 machine code; bank switched: can run processes in separate address spaces (memory banks), letting 16-bit Z80s run very many processes and host much software and data areas. http://home.swipnet.se/~w-68269/osx/osx.htm
Simple yet powerful; small yet flexible; comprehensive yet easy to use and understand. Modern message-based architecture. Introduced June 1992, many uses: cell phones, small handheld devices, large factory automation systems, Space Shuttle. http://www.concentric.net/~Tics/
A fast (190 cycle context switch), small (1-1.5 K), designed and optimized for next generation DSP systems; and Fusion Net (TCP/IP Stack), Fusion Web (services); all support priority based, realtime, preemptive, multitasking. By DSPOS, Inc. http://www.dspos.com/DSPOSWeb/rtos/fusion_RTOS.htm
In safety-critical systems (nuclear power plants, automated robot control systems, automatic aircraft landing systems) tasks must meet deadlines, most of which are critical since the system cannot survive with some number of deadline failures of subsequen http://ls3-www.informatik.uni-dortmund.de/Melody/
No royalty, full featured, fast, preemptive kernel. Unlike generic C kernels, it exploits strengths of x86 architecture and makes them easily used by programmers. Optimal mix of speed, compactness, functions. Supports ColdFire, PowerPC, x86. By Micro Digi http://www.smxrtos.com/rtos/kernel/smx.htm