I've made available a collection of helpful scripts for Slackware. Here's a short description of a couple.
chksysdeps - checks the library dependencies of all binaries on your system
chktgzdeps - checks the dependencies of a tgz package without unpacking it.
localepurge - removes unwanted language translations from your system (removed about 200MB of them on my medium-sized system)
kwikpkg - a modified checkinstall that runs a bit cleaner and faster.
mkresetperms - creates a script to restore the original file permissions on your system.
show-services shows which services are currently running
undeb unpacks a Debian archive
unrpm unpacks an RPM in the current directory
whichpkg finds which package a file belongs to by reading the Manifest. (This is not the script by Tank which looks among the installed packages)