Back in June, PushBullet devs added SMS functionality to their already-powerful client. The only catch was that compatibility was limited to EvolveSMS. Now, just a week after the update that brought universal copy and paste, PushBullet is getting another version bump that brings the ability to reply to SMS messages from a PC regardless of which client you're using.
It's super simple, yet incredibly useful: upon receiving an SMS message, PushBullet will send a notification to your PC (you'll need either the Chrome extension or Windows Client installed). Hitting the "reply" button will open a new popup, where you can, um, reply. Easy peasy.
It's not quite as full featured as something like MightyText, but if you're already a PushBullet user looking for a way to simplify your life a little bit more, here it is. Enjoy.