Svelto ECS C# Entity Component System
Free game engine for development of desktop, mobile, and web games
An easy to use 2D HTML5 game engine written in TypeScript
Multi-platform 2D and 3D game engine
Stride (formerly Xenko), a free and open-source cross-platform C# game
Cross-platform game engine in Rust
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
Free, open source game engine online
Entitas is a super fast Entity Component System (ECS) Framework
Engo is an open-source 2D game engine written in Go
Open source reimplementation of GTA San Andreas game engine in Unity
3D C++ Game Engine - yet another open source game engine
Clojure in Unity
The Atomic Game Engine is a multi-platform 2D and 3D engine
2D physics engine for games
cross-platform 2d game engine
Cross-platform 2D game engine