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.
Kite is a cinematic created in Unreal Engine 4 and features a diverse and beautifully realized 100 square mile landscape.
Houdini Engine for Autodesk Maya
SideFX have released Houdini Engine for Maya, with 3ds Max and Unreal versions coming soon.