AngelList

Real-time sync of SMS, Phone Calls & other phone activity between your Android phone & computer. Text messages are just the beginning for us; think of it as the "hook" for a much larger vision.

Uses your current Android phone number, so all text messages stay completely in sync between the phone and computer. No extra phone numbers. Uses existing SMS data stream on the phone.

Users have called it "iMessage for Android", "SlingBox for Android"