Epic has included features from acquired companies like Quixel in the engine, which is seen as helped by Fortnite's revenue. Epic waives their royalties margin for games until developers have earned US$1 million in revenue and the fee is waived if developers publish on the Epic Games Store. Its source code is available on GitHub, and commercial use is granted based on a royalty model. The latest generation, Unreal Engine 5, was launched in April 2022.

Unreal Engine is written in C++ and features a high degree of portability, supporting a wide range of desktop, mobile, console, and virtual reality platforms. Initially developed for PC first-person shooters, it has since been used in a variety of genres of games and has seen adoption by other industries, most notably the film and television industry. Unreal Engine ( UE) is a 3D computer graphics game engine developed by Epic Games, first showcased in the 1998 first-person shooter game Unreal. Source-available commercial software with royalty model for commercial use

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