Mixamo has announced that a collection of its animations and 3D characters are now available for free in Unreal Engine 4.3.
Unreal Engine - Open World Demo Collection - Free
Epic Games are giving away assets from their Open World demo, to be used within Unreal Engine 4 based products.
Unreal Engine Sizzle Reel
See a collection of games using Unreal Engine in this new sizzle reel.
Dynamic Lighting Gameplay with UE4 and Enlighten using Blueprints
Geomerics have posted a detailed article on how they used Unreal Engine together with Enlighten.