[Kitten]

Code:

groups:
    Admin:
        info:
            rank: 3
        permissions:
            - 'permissions.node'
            - 'permissions.node'
    Moderator:
        info:
             rank: 2
        permissions:
             - 'permissions.kick'
             - 'permissions.modchat'
             - 'permissions.modchat.disable'
    User:
         info:
              rank: 1
         permissions:
             - 'permissions.help'

This is most likely the permissions addon for minecraft servers.

EDIT: already been said