StreamWithFriends allows your friends webcams to appear on your stream all through a web broswer. It's built on WebRTC and has a simple layout to display yours and friends webcams down the left side. StreamWithFriends is easily customizable with basic web development experiance.
This is still in it's early stages, and in result is not very pretty, however still looks great on stream. Screenshot.
StreamWithFriends needs to be hosted remotely with SSL enabled. Heroku can do that for you for free.
https://YOURAPP.herokuapp.com/stream, and make it fit your screen.