What are the apps which is you most if I talk about myself then I mostly use Gmail and Inbox ! What about you all ?

I do not own a "smart" phone .

Not in any specific order, but ones I use a lot:

Chrome

Gmail

Google Maps

Facebook

ES File Explorer

Spotify

Google Play Books

Wikipedia

IMDB

YouTube

My bank's app

Local transport network app

Out of Milk

Quick Office

most to least...

MS visual studio 2012 express C++

CScript macro processor / code generator (in-house tool)

Rome II Total War

Skyrim

Fallout 3

Youtube - research for simulator games

Gmail

Spider solitaire - waiting for downloads

Truespace 7.61 Rosetta

Paint.net

Audacity

Free Clone Stamp Tool

RVsiteBuilder (online app)

2048

From my phone? Nothing.

Emails (Yahoo, GMail, etc)

Calendar

Flashlight

Calculator

Notepad/TODO

What's App/Google Voice

Castle Clash

Boom Beach

Stock

Maps

Camera

Web Browser

And obviously, the Phone itself!

Calculator
Calendar
Camera

Email

Flashlight

Google Maps

Notepad
Whatever the internet browser is.

I don't tend to use "social media" applications or websites.

Games that have gotten a few months of attention:
Nethack, Mahjong, Picross, Cribbage, 2048, Sudoku, Puzzle Forge, Angry Birds

Currently playing Carcassonne but getting distracted with Nethack again.

I do not own a "smart" phone .

Oops, I would say you may be missing something great going on, I would say it would be better to get a smartphone ! :D You are missing all the fun out their ...