Mailbox
I like how easy it is to manage my email by archiving it or snoozing until later. This keeps email out of my way during the day because it only alerts me when I tell it to.
Valuta+ - Currency Converter for iOS. I'm living abroad and traveling a lot, so it's important for me to keep track on the exchange rates when being offline. It's very minimalistic and simple to use.
Probably 'Readit' for Windows Phone 8.1 It's a Reddit client.
Pocket for android.
Although I am in a 'policy of less mobile use'.
Emacs.
zsh.
Ruter
It's the app for checking bus/boat/subway/tram timetables for Oslo (where I live in Norway).
It shows the next arrival/departures for the stops close to me.
It let's you specify two locations, and tells you how to travel between them.
And it has a favourites, so that you can quickly check if you need to run to catch the next bus to work.