Minix (study OS developed by Andrew S. Tanenbaum in the Netherlands)
Plan 9 (distributed OS developed at Bell Labs, based on original Unix design principles yet functionally different and going much further)
Inferno (distributed OS derived from Plan 9, originally from Bell Labs)
Plan B (distributed OS derived from Plan 9 and Off++ microkernel)
Solaris, contains original Unix (SVR4) code (code now open source via OpenSolaris project)
Unix (OS developed at Bell Labs ca 1970 initially by Ken Thompson)
Xinu, (Study OS developed by Douglas E. Comer in the USA)
Open source Unix-like
Agnix (educational)
BSD (Berkeley Software Distribution, a variant of Unix for DEC VAX hardware)
FreeBSD (one of the outgrowths of UC Regents' abandonment of CSRGs 'BSD Unix')
DesktopBSD FreeBSD distribution for desktop use
PC-BSD FreeBSD distribution for desktop use
DragonFly BSD forked from FreeBSD
NetBSD (one of the outgrowths of UC Regents' abandonment of CSRG 'BSD Unix')
OpenBSD forked from NetBSD
GNU Hurd
Linux
OpenDarwin
OpenSolaris, contains original Unix (SVR4) code
SSS-PC Developed at Tokyo University
Syllable
VSTa
GNU/Fiwix
UnixLite
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