Aptitude is a menu-driven, text-based front-end to the Advanced Packaging Tool (APT) system.
Synaptic is a graphical package management front-end for APT. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+.
Tasksel ia a tool for selecting installation of a group of packages for
specific tasks. For example, DNS, SMTP, etc.