Windows/Mac: Google updated the Hangouts Chrome app today with a brand-new design that makes it a lot more appealing to use. The updated app looks a lot like the Android and iOS versions of Hangouts.
The big change here is the refreshed look. The app now features Google's Material Design and has the standard chat layout of your recent contacts on the left side with the chat window on the right. Otherwise, it works exactly as you'd expect Hangouts to work. The app works out of the box on Macs, but Windows and Linux users will want to turn off the transparent mode.