DOS 213
Microsoft Windows 588
Unix
Adrenaline 11
Apostle 14
AtheOS 12
BeOS 40
BRiX 8
BSD-OS 1
BugOS 117
DragonFly BSD 9
DR-DOS 8
EduOS 10
Erlang 218
EROS 10
Exopc 11
FDOS 10
Fiasco 13
FreeBSD 73
FreeDOS 11
FreeVMS 71
FullPliant 8
GEM 10
Gemini Nucleus 14
GEOS 16
GNU Hurd 16
Go 82
Ianix
JxOS 223
KolibriOS 4
L4 13
Linux 2,348
MenuetOS 10
MINIX 14
Nemesis 3
NetBSD 49
On Time RTOS-32 223
OpenBSD 95
OS-2 77
OS-C 3
PETROS 117
PIOS 6
Proolix 2
QNX 16
RadiOS 10
ReactOS 10
Roadrunner 10
RT Mach NTT 15
Sanos 11
SCO 196
Scout 6
SkyOS 3
Solaris 67
SPIN 5
ThrillOS 2
TinyOS 14
Unununium 11
V2 OS 6
VSTa 1
VxWorks 4
Yamit 37
| | Intel x86 Architecture - Emulators, Computers 81
Processors - Components, Hardware, Computers 13
DOS and Windows - Disassemblers, Programming, Computers 15
Assembly - Languages, Programming, Computers 79
Open Source - Operating Systems, Software, Computers 14
 DomainatrixDomainatrix
 Assembly language OS for x86 architecture, hot-swappable kernel, made to serve the Web, written originally for programmer's personal interest and education after moving to the PC platform from his old 8-bit machine. Philosophically similar to V2 OS.
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HactarHactar
 Claims: all new, no equivalent design in extant OSs, an adventure into something really different, an answer to a What if? Runs on 386+, system disk is floppy, kernel size 32Kb; manages 4Gb RAM, 2Gb disk; semi-multitasking; unusual interface. [Open Source, WTOF PL]
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HanoiOSHanoiOS
 Self booting x86 OS implementation of Towers of Hanoi puzzle, very simple bootstrap loader and kernel; boots, presents shell-like prompt for valid integer input, used by kernel as count of disks to solve, prints list of moves.
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The Mobius: SourceForgeThe Mobius: SourceForge
 A few screenshots, details, links.
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PM_SZ_OSPM_SZ_OS
 Protected mode, 32-bit OS for i486 CPUs and up, full network stack, supports several filesystems, paging, deferred procedure call support, and virtual multiple screens with different resolution and scrollback. Free download.
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RDOSRDOS
 Multi-process/threaded protected mode OS for all i386+ systems, written in all 16-/32-bit Assembly in TASM, fully PROMable so can port to embedded systems with no keyboard and/or screen, stable and secure via segment protection and paging. [Open Source, GPL]
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ScottsNewOSScottsNewOS
 Runs on i386+ compatible, working GUI even on 4 MB. Coded in Assembly, C. Brief description, download link. [Open Source, GPL]
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Synapse Operating ServicesSynapse Operating Services
 Protected mode, multitasking support, 32-bit; developed on x86-32, intended to run on x86-64 with some changes; DOS-like, but not fully compatible, use: to run ported DOS programs up to 512K. At SourceForge. [Open Source, BSD]
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TriangleOSTriangleOS
 32-bit multitasking, multithreaded OS for x86 386+ CPUs, with GUI, FSs, applications, drivers, all in active development. Site has information, news, documents, screenshots, downloadable releases.
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VisopsysVisopsys
 VISual OPerating SYStem: small, fast, home-brewed, open source OS kernel for x86. Includes project background, screenshots, source code and useful links for OS developers. [Open Source, GPL]
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XAOSXAOS
 Runs on i386+, 16-bit real mode, FAT12/16/32 (read-only, LFN support), coded in C++; downloads: binaries, source, utilities, game (tetris source); downloads. [Open Source]
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