The ioquake3 community effort to continue supporting/developing id's Quake III Arena

UPBGE, the best integrated game engine in Blender

Lina Engine is an open-source , modular, tiny and fast C++ game engine, aimed to develop 3D desktop games.

Awesome list of resources for Game Engine Development.

Archived repository. For current repo, see: https://github.com/etlegacy/etlegacy

High Performance Game Engine for Production Pipeline

FMOD Studio middleware integration and scripting API bindings for the Godot game engine.

Game Engine Development Series - Learn to code a Game Engine in C++ from scratch

Personal repo for learning the vulkan graphics api

Android Memory Access at Runtime: Reading and Writing Using Memory Files and Maps

2D RPG Game creator

Lightweight Sandbox Game Engine using OpenGL for additional Customisation and Quick Prototyping

Kaiju Engine - Multiplatform 2D and 3D Vulkan game engine written in Go/Golang

Open source recreation of original Sonic The Hedgehog 1991 game on C++ programming language.

Code accompanying the Medium article "Dependency Injection for Games"

📚 Java Game Engine for text-based games.

C++ OpenGL codeless game development engine for Windows.

Prototyping turn based card game

Initial steps into game engine development

TypeScript based 3D game engine.