Caldera Open DOS 

Caldera Opendos is an MS-DOS compatible operating system, the descendant of DR DOS and Novell DOS. It can replace the MS-DOS system, and it's free for non-commercial usage. The full version (with additional networking capabilities) should be registered at the Caldera's Web site. The registration is free, they just want to know about thir users... The registration of the Lite version is not reuired. Starting from the earlier version (called Novell DOS 7) there was a built-in task switcher. Now Caldera extended this feature by providing some kind of multitasking features.

Current Version:   7.01 

Copyright Type:   free for non-commercial use

Home Site: 

Source Code Availability:   partially 

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Software/Hardware Requirements: 

IBM compatible PC with floppy dive and hard disk 
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