A free program for Android, by IJP.

CoverScreen OS is a fantastic application that is not only an awesome cover launcher but also a virtual secondary operating system on your mobile device’s cover screen. With the help of this amazing app, you can use your phone as if you were using a secondary operating system and even use different apps on the phone. You will be able to install apps as if you were installing them on a secondary computer. This is very useful for those people who need to use their devices for different purposes.

This app requires permission to access the cover screen of the device.