Θ Computers: Software: Operating_Systems: Realtime: eCos

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Site list:

eCosCentric Ltd. Commercial provider, maintainer of eCos RTOS; no royalty or license fee, highly configurable (300+ parameters) for embedded systems, runs on most major processors; founded 2002; software, consulting, development, resources. [Open Source]
eCos Home Was Cygnus eCos Sourceware page; Sourceware was Cygnus term for their free, open source software; then was Red Hat page. This was/is the page where open source aspects of eCos are arranged. Descriptions, documents, fora, downloads.
eCos Growing article, with links to many related topics. Wikipedia.
Embedded Software Development with eCos By Anthony J. Massa; Prentice Hall, 2003, ISBN 0130354732, with CD. How to build low-cost, royalty-free embedded systems; covers architecture, installing, configuring, coding, debugging, bootstrapping, porting, other open source software components to extend features, functions.
eCos Porting Guide Tutorial to get OS up and running on new hardware; the first task when using any new OS. By Anthony J. Massa, Embedded.com.