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rtos    

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.
preview: http://ecos.sourceware.org  

rtos    

FreeRTOS - Realtime Scheduler
FreeRTOS.orgTM is a portable, open source, mini Real Time Kernel - a free to download and royalty free RTOS that can be used in commercial applications. Ports exist for many different processor architectures and development tools. Each official port includes a pre-configured example application demonstrating the kernel features, expediting learning, and permitting 'out of the box' development. Free support is provided by an active user...
preview: http://www.freertos.org  

tutorial    

RTOS Report: Selecting an Embedded RTOS
Many, if not all, embedded projects require a real-time operating system. As part of eg3.com's research program, this report details the various options: free RTOSes, embedded Linux, paid RTOSes (commercial) as well as in-depth survey results, overviews, and datasheets. Due to generous vendor sponsorship, this report is availble for FREE for a limited time.
preview: http://www.rtos-report.org  

newsgroup    

comp.realtime
Devoted to realtime computing, both RTOS and realtime issues.
preview: news:comp.realtime  

portal    

Dedicated Systems - Realtime Encyclopedia
Meta-resource on the Web, located in Europe, and focused on identifying and indexing the best resource for realtime systems -- both RTOS and board-level sorts of issues. Has some great 'buyers guide' of available RTOS's and tools, as well as reviews of Windows CE, QNX, etc.
preview: http://www.dedicated-systems.com