Package Tracker is one I use regularly, but that's built into Cortana these days so you may not need it.
I use
OpenTable's app for restaurant reservations.
ScummVM for playing the old school LucasArts point-and-click games (Sam n Max, Day of the Tentacle)
There are plenty of games too, depends on what you're into. The
Forza Motorsport 6 Apex beta is available now.