This app [All in All Alaguraja] provides all needed tools and apps for android device. And also the size of the app is very small. It's about 10mb.

This app includes:

QR Code Scanner
Pedometer
Metal Detector
Accelerometer
Light intensity calculator
Compass

Facebook
Instagram
LinkedIn
Snapchat
Pinterest
Twitter
YouTube
Reddit
Zoom

Amazon
Flipkart
Snapdeal
Justdial
AliExpress
Banggood

IRCTC Train Reservation
Flight booking
Book my show
RedBus

Swiggy
Zomoto
Uber Eats
Domino's Pizza
Pizza Hut

Brainly
Instasolv
Quora

Goibibo
Make my trip
TripAdvisor

All these apps and tools are compressed to a 10mb of size

Source code of this app will be available at GitHub:
https://github.com/SKGEzhil/All_in_All_Alaguraja