Here's the first list of Unreal Engine 4 integrated middleware

Epic Games today launched the Unreal Engine 4 Integrated Partners Program, bringing together more than a dozen middleware technologies and software platforms. The latest Unreal Engine 4 toolset will be integrated with many of the most notable third-party technologies, including Autodesk Gameware, NaturalMotion, Nvidia's PhysX and APEX, Oculus Rift support, Intel's Threading Building Blocks, and RAD Game Tools. Although there are currently no games released that utilize the Unreal Engine 4, the likes of Epic's Fortnite and Phosphor Games' Project Awakened are currently UE4 games in development. Square Enix and Spec Ops: The Line studio Yager Development have also licensed the engine. The full list of inaugural IPP members and products are as follows: Audiokinetic - Wwise Autodesk - Autodesk Gameware Donya Labs - Simplygon Geomerics - Enlighten IDV - SpeedTree for Games Intel - Intel Threading Building Blocks (TBB) NaturalMotion - morpheme and euphoria NVIDIA - PhysX and APEX Oculus VR - Oculus Rift RAD Game Tools - Bink Video and Telemetry Performance Visualizer RealD - RealD Developer Kit (RDK) Umbra Software - Umbra 3 Xoreax - IncrediBuild-XGE