The Android Police team has published a Top Android apps of 2015, check it in the link
The apps that they have used the most are:
Rita
Money Lover
Enpass Password Manager
Jotterpad - Writer
Clue
Google Maps
Cody
LastPass + Authy
SwipePad
Play Music + YouTube
Ryan
Unclouded
Fenix
Action Launcher 3
Bertel
AntennaPod
Micopi
...