What are the best Android apps to get in the Play Store?

My first installed application is the "firewall without root".
It allow you to check which app can or cannot access to internet.
It's usefull if you have limited internet access like me ;)
 
There are no "best".
There are "best for purpose A with this list of requirements" and "best for purpose B with that list of requirements".

What kind of apps are you looking for?
What requirements/features of these apps are you looking for?

Which phone?
Which version of android?
Which carrier?
 

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