/usr/lib/x86_64-linux-gnu/qt5/bin/assistant
/usr/lib/x86_64-linux-gnu/qt5/bin/designer
/usr/lib/x86_64-linux-gnu/qt5/bin/lconvert
/usr/lib/x86_64-linux-gnu/qt5/bin/linguist
/usr/lib/x86_64-linux-gnu/qt5/bin/lrelease
/usr/lib/x86_64-linux-gnu/qt5/bin/lupdate
/usr/lib/x86_64-linux-gnu/qt5/bin/pixeltool
/usr/lib/x86_64-linux-gnu/qt5/bin/qcollectiongenerator
/usr/lib/x86_64-linux-gnu/qt5/bin/qdbusviewer
/usr/lib/x86_64-linux-gnu/qt5/bin/qhelpconverter
/usr/lib/x86_64-linux-gnu/qt5/bin/qhelpgenerator
/usr/lib/x86_64-linux-gnu/qt5/bin/qtdiag
/usr/lib/x86_64-linux-gnu/qt5/bin/qtpaths
You may install this package on Debian with
apt-get
install qttools5-dev-tools