Awesome
MikeOS
Open source 16-bit operating system for x86 PCs
Copyright (C) 2006 - 2014 MikeOS Developers -- see doc/LICENSE.TXT
MikeOS is a 16-bit real mode operating system for x86-compatible PCs, written entirely in assembly language, which boots from a floppy disk, CD-ROM or USB key. It features a text-based dialog-driven user interface, a command-line, support for FAT12 (MS-DOS-like) floppy disks, sound (PC speaker), text editor, BASIC interpreter and more. The kernel includes over 60 system calls.
MikeOS is a learning tool for those wishing to understand simple OS construction and x86 assembly. Quick getting-started guide: MikeOS can run from a floppy disk or CD-ROM, either on an emulator or a real PC. See the disk_images/ directory for files that you can write to the appropriate media or boot in, for instance, VMware, QEMU or VirtualBox.
You can find the source code in the source/ directory, and sample programs (included on the disk images) in the programs/ directory. See the doc/ directory for more info, including:
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handbook-user.html -- How to run and use MikeOS
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handbook-appdev-basic.html -- Writing software in BASIC
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handbook-appdev-asm.html -- Writing software in assembly
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handbook-sysdev.html -- Building and modifying the OS
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LICENSE.TXT -- The open source, BSD-like license
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CHANGES.TXT -- Detailed list of changes in previous releases
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CREDITS.TXT -- People involved in the project
Have fun, and see the website