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

UPBGE, the best integrated game engine in Blender

Awesome list of resources for Game Engine Development.

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

A Cool High Performance Game Engine

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

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

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

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

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

Personal repo for learning the vulkan graphics api

2D RPG Game creator

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

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

C++ OpenGL game development engine for Windows.

📚 Java Game Engine for text-based games.

Code accompanying the Medium article "Dependency Injection for Games"

Initial steps into game engine development

Prototyping turn based card game

TypeScript based 3D game engine.