Epic allows its use in commercial products based on a royalty model, typically asking developers for 5% of revenues from sales, though Epic waives this fee for developers that publish their games through the Epic Games Store. Since 2015, it can be downloaded for free, with its source code available on a GitHub private repository. The latest generation is Unreal Engine 4, which was launched in 2014 under a subscription model.
Written in C++, the Unreal Engine 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 three-dimensional (3D) games and has seen adoption by other industries, most notably the film and television industry. Unreal Engine is a 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
