With so many implementations of Google sometimes we can be confuses between one or another, but for those unfamiliar with it, Messenger is a lighter and even basic Hangouts alternative, which is only aimed SMS, unlike the other that supports video calling, messaging Google+ and of course, if we predefine SMS as well.
For those who have Android Lollipop, in the latest update to version 1.3, Google Messenger adds quick reply, because from the same notification from any screen "Answer" will appear a popup window, where this can draw the desired text opens to send to your contact.
Last but not least interesting, it is the new addition to this, because we have a widget to apply in any main screen of our terminal, which will serve the style of floating window in order to visualize the conversation via SMS to the selected contact also quick to enter the access application, two in one.
If the SMS are no longer primary messaging method but want to use these new features, we provide the APK safely, once downloaded and installed you will have the version 1.3 of Google Messenger, as usual, for free.