/usr/bin/certtool
/usr/bin/crywrap
/usr/bin/danetool
/usr/bin/gnutls-cli
/usr/bin/gnutls-cli-debug
/usr/bin/gnutls-serv
/usr/bin/ocsptool
/usr/bin/p11tool
/usr/bin/psktool
/usr/bin/srptool
You may install this package on Debian with
apt-get
install gnutls-bin