EnTT is a header-only, tiny and easy to use library for game programming and
much more written in modern C++, mainly known for its innovative
entity-component-system (ECS) model.
Among others, it's used in Minecraft by Mojang, the ArcGIS Runtime SDKs by Esri
and The Forge by Confetti.

WWW: https://github.com/skypjack/entt/wiki