Heads-up notifications アプリ
With this app, any device can get the heads-up notifications introduced in Android 5 “Lollipop”, no root required. And the popups actually look like those in Android Lollipop. But according to Addictivetips (and a lot of the users), this app “has done more than just replicate a feature of Lollipop. Even if you aren’t dying to try Lollipop and some of its new features, this app is worth a try“.
NOTE: According to the project’s ReadMe, active development has stopped.
