Use Cases and Deployment Scope
We use Unreal Entine to augment our normal 3d visualization workflow. Primarily it is used to add functionlaity to 3d environments, develop VR products and provide realtime render capabilities. It's really easy to export models and textures from our primary software, 3ds Max, to Unreal Engine and then continue to develop the model. Epic Games, the developer of UE has spent a lot of time and money to make sure UE plays nice with everybody.
Other Software Used
Autodesk 3ds Max, Adobe After Effects, Adobe PhotoShop