Penny's OS (S 22)

 
                        or V
or Vapour or VAXELN
or VAX/VMS or VectorLinux
or VENIX or VENUS
or Verax or VERSAdos
or VidaLinux or VideoLinux
or vikek OS or Vine
or Vino or VIROS
or Visi On or Visopsys
or Visual Network OS or Vixta
or VLOS or VM/CMS
or VM-CP or VME/B
or VME/K or VM/ESA
or VM/IX or VMiX x86
or VMKnoppix or VM PC
or VMS or VM/SP
or VM/370 or VM2000
or VMUNIX or VM/VSE
or VM/XA or VNLinux
or VoltaLinux or VOLVIX
or VORTEX or VOS
or VPS/VM or VRTX
or VRX or VS
or VSAM or VSE
or VSE/ESA or VSE/SP
or VS/9 or VSOS
or VSTa or VS-2
or VTOS or V2 OS
or VULCAN or VxWorks