Kiwix

The offline version of Wikipedia on your phone

Picture Insect

Insect identifier for cell phones

Shroomify

Discover all the secrets of mushrooms

Instructables

All the tutorials you can think of

wikiHow

Consists of tens of thousands of explanatory tutorials

Plant App

Learn to identify and care for plants

Dog Scanner

Convenient dog breed identifier

Plant Care Reminder

Learn to take care of your plants

Google Expeditions

Travel around the world thanks to virtual reality

Samsung Members

Make the most of your Samsung device

iFixit

An all-purpose repair manual

Google Arts & Culture

Google brings art to your smartphone

Rock Identifier

Identify rocks and discover the rocks around you

HiCare - Huawei

Huawei post-sales service app

Infocar

Digital car diagnostic tool

ElectroDroid

Resources for electronics professionals and enthusiasts

Arlo Secure

Control your security system from your phone

Xmeye

Check your security cameras

YYP2P

Control IP security cameras with your mobile phone

LiveYes

Monitor your store or home through remote video cameras

Iriun 4K Webcam

Turn your Android into a webcam

Spyzie

Parental control application

USB Camera

Use a mobile as a camera for your PC

Nest

Google's video surveillance and home automation control app

Camy

Set up a live video surveillance system with an old cell phone

Vivint

Control your smart home security system from your smartphone

Alfred

Keep an eye on your home with your old smartphones

TrackView

Turn any device into a security camera

V380 Pro

View the recordings from your cameras

Yoosee

Watch your home through wifi cameras

CatWatchful

Parental control app for spying on mobile phone activity