debget - Fetch a .deb for a package in APT's database
dpigs - Show which installed packages occupy the most space
debman - Easily view man pages from a binary .deb without extracting
debmany - Select manpages of installed or uninstalled packages
checkrestart - Help to find and restart processes which are using old
versions of upgraded files (such as libraries)
popbugs - Display a customized release-critical bug list based on
packages you use (using popularity-contest data)
which-pkg-broke - find which package might have broken another