A free program for Android, by wilco375.

Floating Apps is a handy tool that lets you add several floating apps to your Android device. It is a very easy-to-use application that does not require any technical knowledge to use. 

To start using the application, you will first need to download it from Google Play. Once you have installed it, you will be able to add any application to the list by simply clicking the plus button. After that, you can easily launch the app by clicking the list item. You can also add a quick settings tile to your status bar that will launch the app if you are using at least Android 7.