On Debian-derived systems, the list can be found with: aptitude search '?installed ?not(?automatic)' (or filter with that within the program, etc.) There's

On Debian-derived systems, the list can be found with: aptitude search '?installed ?not(?automatic)' (or filter with that within the program, etc.) There's probably a way without aptitude, but using Debian without aptitude is like riding a bicycle without gears.