What are some apps you could recommend?

So now that I have a tablet, I’ve discovered the “Play Store”, which has tons and tons of apps. A lot of them are kind of bullshitty though. I’m not interested in games like Candycrush or Angry Birds. Can anyone recommend any cool apps, free or paying, doesn’t matter.
There are so many, it would take me years to go through them. So far I have the PlayStation app, Dragon Age Wiki and a trivia thing which is cool. What else is there that’s cool?
Thanks yall.