Standalone Google Hangouts Web App

Now you don't have to open Gmail or Google+ to use Google Hangouts: just go to hangouts.google.com in your favorite desktop browser and check the new standalone web app for Google Hangouts. The site redirects to talkgadget.google.com, so you can use this URL too.

"We are launching another way to use Hangouts today. From our new site you'll be able to take advantage of the best of Hangouts in the browser, along with an inspiring image to get you through the day," says Google's Jordanna Chord.

It's actually a slightly different interface for the Hangouts feature from Gmail, except that Gmail has been replaced with a wallpaper you can't change, the Hangouts roaster is bigger and there's a navigation menu.