This is a list of different Unix variants, please do not add Linux distributions to the list, there should be a different list for those. The vast majority of the Unixes listed are from The operating systems catalog , from the Open Group, or from the Unix History files Note most of these are not the part of official standard called Unix. : Top - 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z