Slack

The 21st-century team communication tool

imo

Instant messaging and video and audio calls for free

WhatsApp Messenger

The number one instant messaging application

WhatsApp Business

The WhatsApp app designed for businesses

AyuGram

A Telegram MOD based on exteraGram

Telegram

Fast, secure and versatile instant messaging platform

Facebook Messenger

The Facebook app for messaging, voice and video calls

Azar

Make video calls with anyone in the world

Thunderbird

Mozilla's multifunctional mail client in its Android version

LINE

One of the most innovative instant messaging apps

Microsoft Teams

More productivity and better company communications

TextNow

Free phone calls and text messages

Messenger Lite

The lightweight version of Facebook Messenger for Android

WeChat

One of the best chat apps

Messages by Google

Chat with all your contacts with Google's app

KakaoTalk

Communicate by chat and video and voice messages

Arlo Secure

Control your security system from your phone

Xmeye

Check your security cameras

Alfred

Keep an eye on your home with your old smartphones

LiveYes

Monitor your store or home through remote video cameras

CatWatchful

Parental control app for spying on mobile phone activity

Vivint

Control your smart home security system from your smartphone

YYP2P

Control IP security cameras with your mobile phone

Iriun 4K Webcam

Turn your Android into a webcam

Spyzie

Parental control application

Yoosee

Watch your home through wifi cameras

Camy

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

V380 Pro

View the recordings from your cameras

TrackView

Turn any device into a security camera

USB Camera

Use a mobile as a camera for your PC

Nest

Google's video surveillance and home automation control app