...and IIRC deborphan has also been around for a while:
NAME
deborphan - Orphaned package finder
SYNOPSIS
deborphan [OPTION]... [PACKAGE]...
DESCRIPTION
deborphan finds packages that have no packages depending on them.
The default operation is to search only within the libs and
oldlibs sections to hunt down unused libraries.
If it is invoked with an optional list of packages, only the
dependencies on those packages will be checked. The results are
printed to stdout as if the option --show-deps had been given.
Searching for specific packages will show the package, regardless
of its priority. It is possible to specify -, to read a list of
packages from standard input.
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