Ardence Embedded OEM Development Platform
Ardence, a Citrix Company, has embedded solutions that include RTX, ETS and ReadyOn. RTX is a real-time solution that enhances the control of Windows®, providing greater flexibility and reliability. ETS is the smallest-footprint Win32 real-time operating system in the market, and ReadyOn provides instant-on functionality for Windows® devices.

Embedded OEM Development Platform

os    

CP/M - Operating System for 8-bit Computers
CP/M comes/came in three main versions; 1.4, 2.2 and 3.1. v2.2 was the basis of MSDOS, while v3.1 evolved into DRDOS and OpenDOS / DR-DOS. There were also 8086 and 68000 versions of CP/M. CP/M-86 evolved into DOS Plus, Concurrent DOS and REAL/32.
preview: http://www.seasip.demon.co.uk  

os    

RxDOS
RxDOS is a fast MS-DOS clone that supports very large disk drives, FAT32 volumes, and Windows 95/98 Long Filenames
preview: http://sourceforge.net  

vendor    

DOS Solutions
DOS, has to be the most reliable and stable of all Operating Systems. For thoses who don't like Windows bloat-ware and find Linux confusing or duanting it's supplies a stable OS. It's a shame it doesn't have a shell like bash. Though, the majority a programs load and run a lot quicker than those of Windows © & XWindows ©. This site has some great DOS links, and some DOS shareware, too.
preview: http://www.dossolutions.pwp.blueyonder.co.uk  

Microsoft Windows Embedded - Try it free!

project    

Project: RxDOS
RxDOS is a fast MS-DOS clone that supports very large disk drives, FAT32 volumes, and Windows 95/98 Long Filenames Development Status: 4 - Beta Intended Audience: Developers, End Users/Desktop
preview: http://sourceforge.net  

rtos    

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.
preview: http://www.freedos.org  

tutorial    

PC DOS 7 Technical Update
This book is a technical reference, upgraded from IBM DOS 5.02 and written for DOS programmers, who develop applications for IBM Personal Computers or compatible systems. The program developer should be competent on the IBM Personal Computer and/or the Personal System/2 and should be familiar with DOS and at least one personal computer programming language.
preview: http://www.redbooks.ibm.com  

newsgroup    

comp.os.msdos.programmer
DOS programmer newsgroup.
preview: news:comp.os.msdos.programmer