Native iMessage for Android
If you're a blue bubble, but there are people in your life that transform you against your wishes into a green bubble, watch this video and then send them a link and tell them to install and pay for Beeper Mini. There are people in my life I'd be willing to give $24 a year to just to avoid having to deal with awful group chats.
Absolutely incredible innovation, with the hard part—reverse-engineering the iMessage authentication handshake—having been done by an apparent high school student in an open source project this summer. Even more incredible is that the nature of the design will make it very difficult and undesirable for Apple to ban effectively. Leave it to a curious individual to accomplish something that massive corporations and regulators did nothing but complain about for over a decade.