Pushbullet can't seem to stop rolling out useful updates. Users can now reply to SMS messages from the desktop, regardless of what app you use for texting.
Previously Pushbullet enabled desktop SMS, but it was limited to users of EvolveSMS. Now the service works with any texting app, including the Android default, Hangouts. When you receive a text message, a card will pop up on your desktop. Click the reply button, and you can send a message via your native app.