Pennyy's OS (S 21)

 
or UberOS or UbixOS
or ubuntu or ubuntu eee
or ubuntu JeOS or ubuntu Lite
or ubuntu Minimal Desktop or ubuntu Mini Remix
or ubuntu Mobile or ubuntu Netbook Edition
or ubuntu Privacy Remix or ubuntustudio
or UCLA Locus or UCLA Secure
or uClinux or UCS
or UCSD-p or udos
or Ufficio Zero or UHC
or UHU-Linux or UKnow4Kids
or uL or U-lite
or Ulteo or Ultima
or Ultimate or ULTRADOS
or Ultrix or Umax
or UMD or UMES
or Umix or UMMPS
or UMN or Underground
or uNETix or Unicos
or Unicox-max or Unics
or Unifix Linux or UniFLEX
or UNI/OS or UniPlus
or Uniq or UniqueOS
or Unison/Reliant pSOS or Unison RTOS
or Unisys or Unisys OS 2200
or Unisys U5000 or Unity
or UNIX or UNIX-RTR
or Unix System III or UNIX 32M
or UNIX Time-Sharing System or UnixWare
or UNOS or UNSW
or Unununium or U-OS
or Urli OS or UserLinux
or USG or USIX
or USS or USX
or UTEK or UTILEX
or UTS or Ututo
or UTX-32 or ux
or UXP/DS or UXP/V
or UZIX