This app lets you access your waves (at Rizzoma.com) and collaborate with others within a hangout. For more info on this app, follow this Google+ Page: This one's for Google Wave fans. Rizzoma.com
Click on this button to enable the app in your Hangouts:
To enable the app, just click on the Hangout button and once the hangout opens, follow the prompts to allow the app access to your account. Once you've done this, the app will be available in the Apps tab within your hangout.