Toolbox on the Samsung Galaxy S5 quickly takes you to your five favorite apps

If you use the same five apps over and over and over again, a new feature on the Samsung Galaxy S5 can help you access them quickly. Called Toolbox, the mini app-drawer can be enabled from the quick settings area of the device. Toolbox provides a floating window from which you can select one of your five favorite apps and quickly launch it.
Toolbox is a white circle with three dots. When you tap on it, it expands to show your five favorite apps. You can select the fave five by going to Settings > Toolbox.
This sounds like a handy, ahem, tool which will surely end up on the Samsung Galaxy Note 4.

Toolbox will help you get to your favorite apps faster

source: AndroidCentral