addresses-goodies-for-gnustep 0.4.8-3 (s390x binary) in ubuntu cosmic

 This package contains a couple of things that might be of use:
  adgnumailconverter
   A tool that will merge your GNUMail address book into the Addresses
   database.
 .
  adserver
   A stand-alone Addresses network server.
 .
  adtool
   A command-line tool for address database manipulation.