I don't use a lot if apps, I'm very selective.
I spend hours testing new ones :)
So the ones below are great ones, believe me.
I use them every day.
They are all free (freemium but you can survive with the free version).
Elevate. Train your brain 5 min a day. It's addictive, UX is awesome and... it works.
Yahoo New Digest. 8 news a 2 times a day. Nothing more. Great interface and meta data aggregation. Yes it's Yahoo but it's not bad, give it a chance.
Memrise. Learn new languages without noticing. (and choose it you want to "plant" or "water" - check the app to understand).
Feedly. Yes, RSS is still the best way to consume news. And Feedly is the best RSS reader (for me).
Pocket. Because there is a time to pin info and a time to read info. The best "read it later" app ever.
Buffer. Share on social media when people read you. Not when you share the info. (got it?)
Of course I use Snaptchat to pretend I'm still young, Facebook, Twitter, Deezer, Instagram, Linkedin, LINE, Runkeeper but EVERYBODY does so...