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

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ROM Dos Demo (Free Version)
The ROM-DOS Single User Version is a Free DOS solution perfect for desktop users and OEMs wanting a single seat drop in replacement DOS. The ROM-DOS Single User Version includes both 6.22 and 7.1 kernels. Long File Names (LFN) are supported along with a full DOS utility suite and is available for electronic download. Documentation is provided in electronic form.
preview: http://datalight.com  

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RTKernel for DOS Demos
The free RTKernel demos listed below contain executable RTKernel demo programs including source and additional documentation about RTKernel for DOS.
preview: http://www.on-time.com