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Proolix
Simple, maximally POSIX compliant mini-OS for i8086+ real mode, coded in C, assembly; uses and needs BIOS for calls. Documents in Russian, Ukrainian, English; description, download: binary, sources. [Free non-commercial use]
http://www.users.itl.net.ua/~prool/proolix.html

ROM-DOS
Full embedded OS; compact, reliable, fully compatible DOS for embedded uses, mobile computing environments, fast connecting of embedded systems to Internet. By Datalight, Inc.
http://www.datalight.com/product_detail.asp?p_id=9&archi ve=0

V2_OS Project Server
Downloads, FTP, specifications, development, projects, articles, FAQ, news, forum, links.
http://v2os.v2.nl/

Ultrix FAQ
Answers to frequently asked questions about software, hardware and networking.
http://www.supelec.fr/decus/faq/faq-ultrix.html

OpenMac
A site that refers to the multiple efforts at porting different flavors of UNIX to the Macintosh and Power Macintosh platforms, primarily representing the Linux for PowerPC and MacBSD projects.
http://www.macbsd.com/openmac/index.html

Shugyo Design Technologies, Inc.
Makes KROS, small (12-64k), standards-based, low cost, no royalty, commercial realtime OS; POSIX, ITRON/uITRON programming interfaces, GNU compiler support, source code provided; supports CPUs: Altera Nios, ARM, Hitachi SuperH. Free downloads: KROS demos, documentation, updates.
http://kros.shugyodesign.com/