Updates :
✔ Added Chat History
✔ Removed Users Email info from connected Users List.
✔ Integrated with hangout notifications on new message.
✔ Bug fixes.

Post has attachment
Hangouts On Air is moving to YouTube Live
Hangouts On Air will no longer be available on Google+ as of 12 September 2016.
Q&A, Showcase, and Applause - These apps will not be available on YouTube Live.
Check Out this new hangout extension going viral as a replacement of hangout default chat extension.
And can be used to collect questions before event like Q&A app.
https://unifiedchat.com

Post has attachment
Screenshots :

This is how it looks inside hangout and to the live event audience.
Photo
Photo
8/18/16
2 Photos - View album
Wait while more posts are being loaded