First of all, you don't want an "app". Right? :)



I agree with Firefox and Vim. For Word, I highly suggest you to learn LaTeX (if you have the time for that).

For a Calendar, if you're a terminal guy, there's calcurse or wyrd, but I think Google (Keep, Calendar) will be more suitable for you. For music, you can use Rhythmbox/Banshee/Amarok etc, they are all "iTunes equivalent". If you like to listen to music, and be on the terminal, there's cmus, easy to set up. For something more advanced, check out mpd+ncmpcpp. :)