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This is a list of operating systems for computers.
Hobby OS
Operating systems written for a hobby.
Proprietary
Acorn
- Arthur
- ARX
- RISC OS (was later open sourced under a fully free/open source license)
- RISCiX
Amiga
Atari ST
Apple
Be Incorporated
Digital/Compaq/HP
- AIS
- ITS (for the PDP-6 and PDP-10)
- OS-8
- RSTS/E (ran on several machines, chiefly PDP-11s)
- RSX-11 (multi-user, multitasking OS for PDP-11s)
- RT-11 (single user OS for PDP-11)
- TENEX (from BBN)
- TOPS-10 (for the PDP-10)
- TOPS-20 (for the PDP-10)
- VMS (by DEC for the VAX mini-computer type; later renamed OpenVMS)
- WAITS
IBM
- AIX (a version of Unix)
- ALCS
- Basic Operating System (first system released for the System 360, as an interim)
- DOS/VSE
- MFT (later called OV/VS1)
- MVS (latest variant of MVT)
- MVT (later called OV/VS2)
- OS/2
- OS/360 (first OS planned for the System 360 architecture)
- OS/390
- OS/400
- PC-DOS (IBM's version of DOS)
- SVS
- TPF
- VM/CMS
- z/OS
Microsoft
Personal digital assistants (PDAs)
Microcontroller, embedded
Little operating systems that run on small devices.
Fictional operating systems
Operating systems that have only appeared in fiction or as jokes.
- Lcars - From Star Trek
- ALTIMIT OS - From .hack
- Digitronix - From The Hacker Files
- Hyper OS - From the movie Patlabor
- Penix - Funny word formed from Microsoft Xenix and a not great word
- Wheatonix - April fool's joke.
- GLADOS - Genetic Lifeform and Disk Operating System
- Lex/OS - From DCEU/DCU