/usr/bin/twoftpd-anon-conf
/usr/bin/twoftpd-anon
/usr/bin/twoftpd-auth
/usr/bin/twoftpd-bind-port
/usr/bin/twoftpd-conf
/usr/bin/twoftpd-drop
/usr/bin/twoftpd-switch
/usr/bin/twoftpd-xfer
You may install this package on Debian with
apt-get
install twoftpd