Penny's OS (S 14)

   
or NachOS or NanoBSD
or Nano-RK or Nanos
or Nasgaïa or NASLite
or Nature's Linux or Navyn OS
or NCOS or NCR Unix
or NDIS or NDK
or NECUX or Nemesis
or NeoGEN or NeOS
or Neopwn or NepaLinux
or NetBSD or NetMAX DeskTOP
or Netrunner or NetSecL
or Netstation or Net/2
or NetWare or Netwosix
or Neutrino or Newark
or Newcastle Connection or Newcastle Recursive VM
or NewDeal or NEWDOS
or NewOS or NEWS-OS
or Newton OS or Nexenta OS
or NeXTSTEP or Nexus
or NIDOS or Niigata Linux
or NimbleX or NimbusOS
or Nitix or Node OS
or Nokia OS or NoMad Linux
or NonStop or NonStop Kernel
or NonStop UX or Nonux
or NordisKnoppix or NOS
or NOS/BE or NOS/VE
or Nova or Novell DOS
or Novell NetWare or NOWSMART 386-OS
or NS/GDOS or NSK
or NSMOS or NST
or NSW or nSystem
or nubuntu or NUCLEUS
or Nucleus OSEK or Nucleus PLUS
or Nuclinux or NuttX RTOS
or NuxOne