Earlier this week, Epic Games unveiled Unreal Editor for Fortnite, which is essentially a Fortnite-focused game tool based on the Unreal Engine. Here, you can create your own games using all the graphical and technical assets from Fortnite.
A brief overview of what this game engine offers can be found above, and some tutorials on how to get started with Unreal Editor for Fortnite can be found below.
The public beta for Unreal Editor for Fortnite can be downloaded via the link below.