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Super Ya-DOS was being written from 1998 through 2004. It's a multiuser operating system for x86 machines. It was written in TASM 2.0 and PowerBASIC 2.10f.
Follow these web pages as well,
http://test.nostalgy.net.ru/alien/sites/ya-dos/
http://old-dos.ru/index.php?page=files&mode=files&do=show&id=2691
FreeOS/1 is a Free, Open Source, FreeDOS based Free and Open Source Alternative OS, with open source Microsoft Windows compatibility using HXDOSExtender KernelEx,and ReactOS source code. FreeOS/1 will include new technologies and will be easy to use
uDOS is a free operating system built on the FreeDOS kernel with DJGPP. uDOS provides an integrated suite of features inluding Perl, Python, etc., as well as a Watt-32 based networking environment and ELF library support. Can be run live from CD image.