AFWall+

A firewall with customizable options for Android

InternetGuard

A firewall for Android that doesn't require a root

personalDNSfilter

DNS filter for blocking ads

Folder Lock

Protect all kinds of files on your Android

AdSkip for YouTube

Skip ads on YouTube

Lock WhatsApp

Block access to WhatsApp and other apps

AdFree

Avoid invasive adverts on your smartphone

Hide Something

Protect the privacy of your multimedia files

BlockSite

Stop being distracted by your cell phone

AntiSocial

Limit cell phone use

AppLocker

Lock access to your Android applications

NetGuard

Block your apps from using data and the Internet

Mobiwol

A firewall for Android that does not require root

LOCKit

Lock access to all your applications

Dialer Lock

Hiding apps and blocking their access behind a fake phone app

Safe Gallery

Protect your Android's content

V380 Pro

View the recordings from your cameras

Alfred

Keep an eye on your home with your old smartphones

Vivint

Control your smart home security system from your smartphone

Nest

Google's video surveillance and home automation control app

USB Camera

Use a mobile as a camera for your PC

Camy

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

CatWatchful

Parental control app for spying on mobile phone activity

Yoosee

Watch your home through wifi cameras

Iriun 4K Webcam

Turn your Android into a webcam

LiveYes

Monitor your store or home through remote video cameras

YYP2P

Control IP security cameras with your mobile phone

Arlo Secure

Control your security system from your phone

Spyzie

Parental control application

Xmeye

Check your security cameras

TrackView

Turn any device into a security camera