GNU/Linux Zorin OS Installing Google Hangouts desktop Client Guide
How to Install Google Hangouts Chat Messenger desktop Client on Zorin OS GNU/Linux desktop – Step by step Tutorial.
And Google Hangouts for Zorin OS is a Cross-Platform unified Communications Service that allows members to initiate and participate in Text, Voice or Video Chats.
And to Install Google Hangouts Client on Zorin OS you dispose of some cool Alternatives:
Especially relevant: currently Ferdi is the only completely Free alternative, and so I listed them in order of my Personal Testing Preference.

Google Hangouts Client Zorin OS Installation Guide
- Rambox Install Zorin OS Step-by-step Guide
- Ferdium Install Zorin OS Step-by-step Guide
- Franz Install Zorin OS Step-by-step Guide