google hangout for webinar
http://www.blog.getsocial101.com/usinggooglehangoutforwebinar
You are able to air your Hangout to the general public. You are able to record it, edit the output, and share the recorded event online.

There are many ways for even small businesses to utilize hangouts to connect with their clients, build their brands, increase profits for their businesses, and create excitement.

Perhaps you have a big announcement – a new hire, a new product, or to announce that you have won an award, hangouts let you tell the whole world and provide an interactive record of the event.
Using Google hangout for webinar

PR Taylor Swift aired a hangout to announce her latest album. When her single was published it went straight to #1, more quickly than any other song in history.

http://www.blog.getsocial101.com/usinggooglehangoutforwebinar

related best software for webinar videos
http://youtu.be/ObZq74oqqsc