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

  acct            https://svn.sv.gnu.org/viewvc/trunk/?root=acct
  anubis          https://git.sv.gnu.org/gitweb/?p=anubis.git
  augeas          https://github.com/hercules-team/augeas
  autobuild       https://josefsson.org/autobuild/
  barcode         https://git.sv.gnu.org/cgit/barcode.git/
  bison           https://git.sv.gnu.org/gitweb/?p=bison.git
  clisp           https://sourceforge.net/p/clisp/clisp/ci/default/tree/
  coreutils       https://git.sv.gnu.org/gitweb/?p=coreutils.git
  cmogstored      https://bogomips.org/cmogstored/
  cpio            https://git.sv.gnu.org/gitweb/?p=cpio.git
  CSSC            https://git.savannah.gnu.org/cgit/cssc.git
  cvs             https://cvs.sv.gnu.org/viewcvs/cvs/ccvs/
  cvsps           https://sourceforge.net/projects/cvsps/
  diffutils       https://git.sv.gnu.org/cgit/diffutils.git/
  emacs           https://bzr.savannah.gnu.org/lh/emacs/trunk/files
  febootstrap     https://people.redhat.com/~rjones/febootstrap/
  findutils       https://git.sv.gnu.org/gitweb/?p=findutils.git
  freedink        https://git.sv.gnu.org/gitweb/?p=freedink.git
  gcal            https://git.savannah.gnu.org/gitweb/?p=gcal.git
  gdb             https://sourceware.org/git/?p=gdb.git;a=summary
  gettext         https://git.sv.gnu.org/gitweb/?p=gettext.git
  gengetopt       https://git.sv.gnu.org/gitweb/?p=gengetopt.git
  gmediaserver    https://cvs.sv.gnu.org/viewvc/gmediaserver/gmediaserver/
  gnuit           https://www.gnu.org/software/gnuit/
                  https://git.savannah.gnu.org/gitweb/?p=gnuit.git
  gnutls          https://www.gnutls.org/
                  https://gitlab.com/gnutls/gnutls.git
  gpg             https://gnupg.org/
                  https://git.gnupg.org/
  grub            https://git.savannah.gnu.org/cgit/grub.git
  gsasl           https://git.sv.gnu.org/gitweb/?p=gsasl.git
  gss             https://git.sv.gnu.org/gitweb/?p=gss.git
  gtkreindeer     https://git.sv.gnu.org/gitweb/?p=gtkreindeer.git
  gtk-vnc         https://git.gnome.org/browse/gtk-vnc/tree/
  grep            https://git.sv.gnu.org/cgit/grep.git/
  guile           https://git.sv.gnu.org/gitweb/?p=guile.git
  gzip            https://git.sv.gnu.org/cgit/gzip.git/
  hello           https://git.sv.gnu.org/gitweb/?p=hello.git
  hivex           https://github.com/libguestfs/hivex
  icoutils        https://git.savannah.nongnu.org/cgit/icoutils.git/tree/
  inetutils       https://git.sv.gnu.org/gitweb/?p=inetutils.git
  iwhd            https://git.fedorahosted.org/git/?p=iwhd.git
  jugtail         https://cvs.savannah.gnu.org/viewvc/?root=jugtail
  jwhois          https://cvs.sv.gnu.org/viewvc/jwhois/jwhois/
  libdap          https://scm.opendap.org/svn/trunk/libdap/
  libffcall       https://savannah.gnu.org/projects/libffcall/
  libgnupdf       https://bzr.sv.gnu.org/lh/pdf/libgnupdf/trunk/files
  libguestfs      https://github.com/libguestfs/libguestfs
  libiconv        https://git.sv.gnu.org/gitweb/?p=libiconv.git
  libidn          https://git.sv.gnu.org/gitweb/?p=libidn.git
  libidn2         https://josefsson.org/libidn2/
  libksba         https://www.gnupg.org/related_software/libksba/index.html
  libntlm         https://git.savannah.nongnu.org/gitweb/?p=libntlm.git;a=tree
  libprelude      https://trac.prelude-ids.org/browser/trunk/libprelude/
  libpreludedb    https://trac.prelude-ids.org/browser/trunk/libpreludedb/
  libtasn1        https://git.savannah.gnu.org/gitweb/?p=libtasn1.git
  libunistring    https://git.sv.gnu.org/gitweb/?p=libunistring.git
  libvirt         https://libvirt.org/
                  https://libvirt.org/git/?p=libvirt.git;a=summary
  m4              https://git.sv.gnu.org/gitweb/?p=m4.git;a=summary
  mailfromd       http://git.gnu.org.ua/cgit/mailfromd.git/tree/
  mailutils       https://git.sv.gnu.org/gitweb/?p=mailutils.git
  man-db          https://bazaar.launchpad.net/~cjwatson/man-db/master/changes
  miktex          https://miktex.org/
                  https://github.com/MiKTeX/miktex
  mini-httpd      https://git.sv.gnu.org/gitweb/?p=mini-httpd.git
  msmtp           https://sourceforge.net/p/msmtp/code/ci/master/tree/
  myserver        https://git.sv.gnu.org/gitweb/?p=myserver.git;a=summary
  nagios-plugins  https://github.com/nagios-plugins/nagios-plugins
  Net::CDP        http://cpansearch.perl.org/src/MCHAPMAN/Net-CDP-0.09/libcdp/
  netcf           https://fedorahosted.org/netcf/
  OATH Toolkit    https://gitlab.com/oath-toolkit/oath-toolkit/
  octave          https://hg.savannah.gnu.org/hgweb/octave/
  OPeNDAP         https://scm.opendap.org/svn/trunk/
  parted          https://git.debian.org/?p=parted/parted.git;a=summary
  patch           https://git.sv.gnu.org/gitweb/?p=patch.git
  prelude-lml     https://trac.prelude-ids.org/browser/trunk/prelude-lml/
  prelude-manager https://trac.prelude-ids.org/browser/trunk/prelude-manager/
  pspp            https://git.sv.gnu.org/gitweb/?p=pspp.git
  radius          https://git.sv.gnu.org/gitweb/?p=radius.git
  recutils        https://git.savannah.gnu.org/gitweb/?p=recutils.git
  reindeer        https://git.sv.gnu.org/gitweb/?p=reindeer.git
  rcs             https://git.savannah.gnu.org/cgit/rcs.git
  sed             https://git.sv.gnu.org/gitweb/?p=sed.git
  sharutils       https://git.sv.gnu.org/gitweb/?p=sharutils.git
  shishi          https://git.sv.gnu.org/gitweb/?p=shishi.git
  tar             https://git.sv.gnu.org/gitweb/?p=tar.git
  texinfo         https://cvs.sv.gnu.org/viewcvs/texinfo/texinfo/
  tmpwatch        https://fedorahosted.org/tmpwatch/
  vc-dwim         https://git.sv.gnu.org/gitweb/?p=vc-dwim.git
  wdiff           https://bzr.savannah.gnu.org/lh/wdiff/trunk/files
  wget            https://git.savannah.gnu.org/gitweb/?p=wget.git
  wget2           https://git.savannah.gnu.org/gitweb/?p=wget/wget2.git
  wydawca         http://git.gnu.org.ua/cgit/wydawca.git/
  wyslij-po       http://svn.gnu.org.ua/viewvc/wyslij-po/trunk/
  zile            https://www.gnu.org/software/zile/

The following packages are using gnulib without gnulib-tool:

  libtool         https://git.sv.gnu.org/gitweb/?p=libtool.git
  libgcrypt       https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git

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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