Google now lets you join Hangouts as a guest, no account needed
 

The worst thing about organizing an online meeting is squabbling over platform. Should you choose WebEx? Skype? Google? Your decision just got a little easier. As of today, you no longer need to have a Google account to join a meeting Hosted on Han...

http://www.engadget.com/2015/11/19/g...ccount-needed/