A simple answer is to check the official webpage, "View package list". You can check the list and figure out what you want to install; I like to say that don't be too excited about "Games" section because probably they are not as good as you may expect. lol. I am also not sure that all of them are actually functioning on RaspberryPi, although they are supposed to be working.
|Aptitude running screenshot|
I don't have good experience with "dselect" because it was always asking me how to resolve dependencies or all that. It was the first big huddle I had to go through to use Debian.