Independent OS

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Definition

OS-tans made from no existing lineage, and do not create one of their own. Some of the earliest mainframes are independent systems, as are hobbyist systems not based on Unix or Linux.

List

Mainframes

• Colossus
• CSIRAC
• ENIAC
• FUJIC
• Mertvaya Ruka
• TIFRAC

Other independent systems

• Apple Newton
• Coleco Adam
• Contiki
• DexOS
• DigiComp
• ECOS
• EMAG-III
• GENIAC
• MITS Altair 8800
• IMSAI 8080
• Sky OS
• Tiny OS

Part of a lineage, but an independent branch

The Linuxes mentioned aren't derived from any distribution.

• CRUX
• Puppy Linux
• Rainbow 100 - only home computer among the DEC faction.
• Tinfoil Hat Linux
• Yggdrasil Linux
• Yoper