to name a few on top of my head..
Moon Reader Pro(for reading books)
Pocket App(to save articles to read later)
Dropbox( got 50gb from buying a new phone)
Bluelight Filter
Insight Timer(for meditation)
LK lottery( for sri lankan lottery results)
ahase thiyenne tharune goyyo, for singithi kattiya who thinks otherwise I recommend reading "The magic of reality" by richard dawkins. Its very easy to read and comprehend.
No offense meant*(i.e. for extremely religious people)