A (very) long time ago, Android introduced a feature to allow you to show certain widgets on the lock screen.
For some reason, this useful feature was removed with the release of Android 5.0 Lollipop, confining widgets to the home screen only. While some manufacturers, such as Samsung, have brought back limited versions of lockscreen widgets, but you're usually limited to the widgets the manufacturer has already created for you. Well, no more! Lockscreen Widgets brings back the functionality of yore, with some extra features.