Recently I've been very much enjoying a few *nix-specific apps.
-tmux, a terminal multiplexer
-newsbeuter, a terminal based RSS reader
-Gnome Maps OH WAIT NO THAT STOPPED WORKING
-Gnome boxes, a very simple and easy to use virtual machine program
-PowerTop, Power utility. This gave an extra hour of battery, and puts Linux on par with Windows for battery
-Conky, because of course
-Gnome-Shell and basic gnome applications, plus various gnome extensions
-xournal, great for taking handwritten notes via touchscreen
-nano, because I haven't spent the time to learn vim and nano is nice and simple and sufficient for my needs
-Bleachbit, for cleaning out the junk
-Onboard on screen keyboard, because it's way better and more configurable than the default gnome keyboard.
And a few applications that are available for both *nix and Windows/OSX
-Google Chrome/Chromium- still my favorite web browser
-Several Chrome apps, like mightytext, hangouts and docs
-Firefox- always good for when 'd rather google didn't track my every move
-Icedove (although I know it's called thunderbird everywhere except Debian)
-Libreoffice
-VLC, because it can play virtually anything
-Gimp