jones_supa writes In 2014, Epic Games took the step of making Unreal Engine 4 available to everyone by subscription for $19 per month. Today, this general-purpose game engine is available to everyone for free. This includes future updates, the full C++ source code of the engine, documentation, and all sorts of bonus material. You can download the engine and use it for everything from game development, education, architecture, and visualization to VR, film and animation. The business scheme that Epic set in the beginning, remains the same: when you ship a commercial game or application, you pay a 5% royalty on gross revenue after the first $3,000 per product, per quarter. Epic strived to create a simple and fair arrangement in which they succeed only when your product succeeds.