My favorite app is Super Hexagon. It's a game where you spin a cursor around a hexagon and avoid lines that are coming toward the center of the screen. It's a simple concept, but it's very fun and addicting.
The app I probably use the most is my Amazon Music app. I like to play my music while working in the lab during the day. I also enjoy the Waze navigator app. I don't use it all the time because fortunately I don't have to ride the highway to work, but whenever I have to get on the highway, I use it to see if it suggests alternate routes to my destination due to traffic.
"I am the rocks of the eternal shore. Crash against me and be BROKEN!!"
Apocalypse - X-Men: The Animated Series