Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

3D Game Engine - yet another open source game engine

C++ game engine focusing on modern rendering techniques and performance.

Engo is an open-source 2D game engine written in Go.

Game engine with an emphasis on architectual quality and performance

A continuation of the popular Artemis ECS framework

C++ Game Engine and Editor

Svelto ECS C# Lightweight Data Oriented Entity Component System Framework

LeoECS is a fast Entity Component System (ECS) Framework powered by C# with optional integration to Unity

An ambient life simulation driven by user activity within a Discord server

WIP ClojureScript game/engine using Pixi.js for rendering.

Entity-Component-System (ECS) with a focus on ease-of-use, runtime extensibility and compile-time type safety and clarity.

A developing game server framework,based on Entity Component System(ECS).

ECS for Lua

🚀Actors is a framework empowering developers to make better games faster on Unity.

Lightweight, multi-platform, data-oriented game engine.

C++ single-header entity component system library

Sample OOP/ECS/DOD project (C++) for an internal Unity lecture in 2018

a fast, type driven, extensible ECS for game development

SpatialOS GDK for Unity

An ECS (Entity Component System) for Python

Realtime 3D Game-Engine with a focus on space sim. Written in C++ 14

🍌 a full-featured Entity-Component-System framework for making games with lua

Entity Component System framework aiming for syntax and usage simplicity with maximum performance for game development.

Entitas++ is a fast Entity Component System (ECS) C++11 port of Entitas C#

EgoCS: An Entity (GameObject) Component System framework for Unity3D