The following packages appear to be using gnulib and gnulib-tool:

  4ti2            https://github.com/4ti2/4ti2
  acct            https://svn.savannah.gnu.org/viewvc/trunk/?root=acct
  ale             https://repo.or.cz/Ale.git/tree
  amanda          https://github.com/zmanda/amanda
  augeas          https://github.com/hercules-team/augeas
  autobuild       https://git.savannah.nongnu.org/gitweb/?p=autobuild.git;a=tree
  barcode         https://git.savannah.gnu.org/gitweb/?p=barcode.git;a=tree
  binfmt-support  https://gitlab.com/cjwatson/binfmt-support
  bison           https://git.savannah.gnu.org/gitweb/?p=bison.git;a=tree
  cgminer         https://github.com/ckolivas/cgminer
  clisp           https://gitlab.com/gnu-clisp/clisp
  cmogstored      https://yhbt.net/cmogstored/
  collectd        https://github.com/collectd/collectd
  complexity      https://git.savannah.gnu.org/gitweb/?p=complexity.git;a=tree
  coreutils       https://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=tree
  cpio            https://git.savannah.gnu.org/gitweb/?p=cpio.git;a=tree
  CSSC            https://git.savannah.gnu.org/gitweb/?p=cssc.git;a=tree
  cvs             https://cvs.savannah.gnu.org/viewcvs/cvs/ccvs/
  datamash        https://git.savannah.gnu.org/gitweb/?p=datamash.git;a=tree
  dc3dd           https://sourceforge.net/p/dc3dd/code/HEAD/tree/
  dico            https://git.savannah.gnu.org/gitweb/?p=dico.git;a=tree
  diffutils       https://git.savannah.gnu.org/gitweb/?p=diffutils.git;a=tree
  emacs           https://git.savannah.gnu.org/gitweb/?p=emacs.git;a=tree
  enchant-2       https://github.com/AbiWord/enchant
  febootstrap     https://fedorapeople.org/cgit/rjones/public_git/febootstrap.git/
  findutils       https://git.savannah.gnu.org/gitweb/?p=findutils.git;a=tree
  freedink        https://git.savannah.gnu.org/gitweb/?p=freedink.git;a=tree
  fuse-overlayfs  https://github.com/containers/fuse-overlayfs
  gcal            https://git.savannah.gnu.org/gitweb/?p=gcal.git;a=tree
  gdb             https://sourceware.org/git/?p=gdb.git;a=tree
  gengetopt       https://git.savannah.gnu.org/gitweb/?p=gengetopt.git;a=tree
  gettext         https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=tree
  gmediaserver    https://cvs.savannah.gnu.org/viewvc/gmediaserver/gmediaserver/
  gnuit           https://git.savannah.gnu.org/gitweb/?p=gnuit.git;a=tree
  gnutls          https://www.gnutls.org/
                  https://gitlab.com/gnutls/gnutls.git
  grep            https://git.savannah.gnu.org/gitweb/?p=grep.git;a=tree
  groff           https://git.savannah.gnu.org/gitweb/?p=groff.git;a=tree
  grub            https://git.savannah.gnu.org/gitweb/?p=grub.git;a=tree
  gsasl           https://git.savannah.gnu.org/gitweb/?p=gsasl.git;a=tree
  gsequencer      https://git.savannah.gnu.org/gitweb/?p=gsequencer.git;a=tree
  gss             https://git.savannah.gnu.org/gitweb/?p=gss.git;a=tree
  guile           https://git.savannah.gnu.org/gitweb/?p=guile.git;a=tree
  gzip            https://git.savannah.gnu.org/gitweb/?p=gzip.git;a=tree
  hello           https://git.savannah.gnu.org/gitweb/?p=hello.git;a=tree
  icoutils        https://git.savannah.nongnu.org/gitweb/?p=icoutils.git;a=tree
  idutils         https://git.savannah.gnu.org/gitweb/?p=idutils.git;a=tree
  inetutils       https://git.savannah.gnu.org/gitweb/?p=inetutils.git;a=tree
  iwhd            https://github.com/markmc/iwhd
  jugtail         https://cvs.savannah.gnu.org/viewvc/jugtail/jugtail/
  jwhois          https://git.savannah.gnu.org/gitweb/?p=jwhois.git;a=tree
  lbzip2          https://github.com/kjn/lbzip2
  libdap          https://github.com/OPENDAP/libdap
  libffcall       https://git.savannah.gnu.org/gitweb/?p=libffcall.git;a=tree
  libiconv        https://git.savannah.gnu.org/gitweb/?p=libiconv.git;a=tree
  libidn          https://git.savannah.gnu.org/gitweb/?p=libidn.git;a=tree
  libidn2         https://gitlab.com/libidn/libidn2
  libntlm         https://git.savannah.nongnu.org/gitweb/?p=libntlm.git;a=tree
  libpipeline     https://gitlab.com/libpipeline/libpipeline
  libprelude      https://www.prelude-siem.org/projects/libprelude/repository
  libpreludedb    https://www.prelude-siem.org/projects/libpreludedb/repository
  libtasn1        https://gitlab.com/gnutls/libtasn1.git
  libtool         https://git.savannah.gnu.org/gitweb/?p=libtool.git;a=tree
  libu2f-host     https://github.com/Yubico/libu2f-host
  libunistring    https://git.savannah.gnu.org/gitweb/?p=libunistring.git;a=tree
  licenseutils    https://git.savannah.gnu.org/gitweb/?p=licenseutils.git;a=tree
  m4              https://git.savannah.gnu.org/gitweb/?p=m4.git;a=tree;h=refs/heads/branch-1.4;hb=refs/heads/branch-1.4
  mailutils       https://git.savannah.gnu.org/gitweb/?p=mailutils.git;a=tree
  man-db          https://gitlab.com/man-db/man-db
  mini-httpd      https://git.savannah.gnu.org/gitweb/?p=mini-httpd.git;a=tree
  mmv             https://github.com/rrthomas/mmv
  myserver        https://git.savannah.gnu.org/gitweb/?p=myserver.git;a=summary
  nagios-plugins  https://github.com/nagios-plugins/nagios-plugins
  nano            https://git.savannah.gnu.org/gitweb/?p=nano.git;a=tree
  netcf           https://pagure.io/netcf/tree/master
  OATH Toolkit    https://gitlab.com/oath-toolkit/oath-toolkit/
  octave          https://hg.savannah.gnu.org/hgweb/octave/file/
  pacemaker       https://github.com/ClusterLabs/pacemaker
  parted          https://git.savannah.gnu.org/gitweb/?p=parted.git;a=tree
  patch           https://git.savannah.gnu.org/gitweb/?p=patch.git;a=tree
  pdf             https://git.savannah.gnu.org/gitweb/?p=pdf.git;a=tree
  poke            https://git.savannah.gnu.org/gitweb/?p=poke.git;a=tree
  prelude-lml     https://www.prelude-siem.org/projects/prelude-lml/repository
  prelude-manager https://www.prelude-siem.org/projects/prelude-manager/repository
  pspp            https://git.savannah.gnu.org/gitweb/?p=pspp.git;a=tree
  radius          https://git.savannah.gnu.org/gitweb/?p=radius.git;a=tree
  rcs             https://git.savannah.gnu.org/gitweb/?p=rcs.git;a=tree
  recutils        https://git.savannah.gnu.org/gitweb/?p=recutils.git;a=tree
  reindeer        https://git.savannah.gnu.org/gitweb/?p=reindeer.git;a=tree
  sed             https://git.savannah.gnu.org/gitweb/?p=sed.git;a=tree
  sharutils       https://git.savannah.gnu.org/gitweb/?p=sharutils.git;a=tree
  shishi          https://git.savannah.gnu.org/gitweb/?p=shishi.git;a=tree
  tar             https://git.savannah.gnu.org/gitweb/?p=tar.git;a=tree
  texinfo         https://git.savannah.gnu.org/gitweb/?p=texinfo.git;a=tree
  time            https://git.savannah.gnu.org/gitweb/?p=time.git;a=tree
  tmpwatch        https://pagure.io/tmpwatch/tree/master
  trader          https://www.zap.org.au/git-browser/trader.git/tree/
  ttfautohint     https://repo.or.cz/ttfautohint.git/tree
  vc-dwim         https://git.savannah.gnu.org/gitweb/?p=vc-dwim.git;a=tree
  wdiff           https://bzr.savannah.gnu.org/lh/wdiff/trunk/files
  wget            https://git.savannah.gnu.org/gitweb/?p=wget.git;a=tree
  wget2           https://git.savannah.gnu.org/gitweb/?p=wget/wget2.git;a=tree
  zile            https://git.savannah.gnu.org/gitweb/?p=zile.git;a=tree

The following packages are using gnulib without gnulib-tool:

  gawk            https://git.savannah.gnu.org/gitweb/?p=gawk.git;a=tree
  gtk-vnc         https://gitlab.gnome.org/GNOME/gtk-vnc/tree/master/
  hivex           https://github.com/libguestfs/hivex
  libguestfs      https://github.com/libguestfs/libguestfs
  libksba         git://git.gnupg.org/libksba.git
  miktex          https://miktex.org/
                  https://github.com/MiKTeX/miktex
  Net::CDP        https://st.aticpan.org/source/MCHAPMAN/Net-CDP-0.09/libcdp/
  wydawca         http://git.gnu.org.ua/cgit/wydawca.git/tree/
  wyslij-po       https://git.gnu.org.ua/wyslij-po.git/tree/

Articles:

  "Using Gnulib to improve software portability",
  by Diego 'Flameeyes' Pettenò on December 28, 2005,
  https://www.linux.com/news/using-gnulib-improve-software-portability

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