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There are 9 operating system those are not linux 1. Plan 9 from Bell Labs Type: Unix‑inspired, distributed OS 2. Haiku Type: BeOS continuation 3. Minix Type: Microkernel Unix-like OS 4. HelenOS Type: Microkernel OS 5. AROS (AROS Research Operating System) Type: AmigaOS-like microkernel 6. ReactOS Type: Windows NT clone 7. FreeDOS Type: DOS clone 8. GNU Hurd Type: Microkernel-based Unix-like OS 9. The BSDs (FreeBSD, OpenBSD, NetBSD, DragonFly BSD) Type: Unix-like derivatives of the original BSD Core Idea & Differences: