Unreal Engine
High-end 3D game engineSource-available
Epic's engine for high-fidelity 3D, with C++ and Blueprints visual scripting, and built-in rendering features like Nanite geometry and Lumen lighting. Also used for film and visualization.
Official siteReach for it when
- High-fidelity 3D on PC and consoles
- Real-time visualization and virtual production
Worth knowing
Full source is on GitHub once you link an Epic account, but it isn't open source: games pay a 5% royalty on lifetime gross revenue above $1M (sales through the Epic Games Store are exempt). There is no official browser export — pick another engine for web games.