"Hangouts Widget completes Android's most popular messaging app" - XDA
"Dead simple and free, what more could you ask for? - LifeHacker
Also featured on Android Community, Talk Android, IntoMobile, Android Headlines, and Droid Life!

Fast, Simple, Elegant

A homescreen widget to show messages (or SMS) received in Google Hangouts

Fully resizable and shows your messages at a glance.

Because of limitations to the Android system, only new Hangouts will be shown and only works for 4.3+

You must first install Google Hangouts! :)
From version Hangouts Widget 2.0:
2.0:
- Lock Screen Widget
- Redesign with transparency and new icon
- Configure transparency for each widget
- New Dark Mode
- bugfixes

If the widget stops working after the update, please readd it. I am aware of an issue where the widget may lose recent conversations, this has been fixed for future updates...
All versions
January 1, 2014