The ioquake3 community effort to continue supporting/developing id's
A 2D rigid body physics engine for the web
A fresh & lightweight javascript game engine
The Tiny JavaScript Game Engine That Can!
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Magic Another Game Engine
Stride (formerly Xenko), a free and open-source cross-platform C# game
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
3D Procedural Game Engine Using OpenGL
The Echo Engine is a simple game engine for text adventure games
Godot Minimal Theme
The HTML5 Creation Engine
Cross-platform game engine in Rust
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
Ct.js is a desktop game engine that makes learning programming fun
A multi core friendly rigid body physics and collision detection lib
Embeddable unity game engine view for Flutter
2D JavaScript Physics Engine
Go bindings for raylib, a simple and easy-to-use library
Svelto ECS C# Entity Component System
Here we're trying to create the easiest open-source game engine.
Orx: Portable Game Engine
High performance UI layout library in C
RTSish Game Engine