google.com - Google Duo - The simple video calling app.
time.com - The 5 Best Apps For Video Calling | Time
google.com - Video Call - Apps on Google Play
att.com - AT&T Video Call – AT&T
wikihow.com - How to Make a Video Call on Skype: 13 Steps (with Pictures)
magnocall.com - Magnocall – Free Video Calls Over the Web – No Downloads
google.com - imo free video calls and chat - Apps on Google Play
whatsapp.com - WhatsApp FAQ - Making video calls
gruveo.com - A No-Login, No-Download Link for Customers to Video Call ...