Godot Engine – Multi-platform 2D and 3D game engine

DOOM Open Source Release

Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

Piccolo (formerly Pilot) – mini game engine for games104

My understanding of Unreal Engine 5's GameplayAbilitySystem plugin with a simple multiplayer sample project.

C++ Action Roguelike in Unreal Engine 5.

A high performance, editable terrain system for Godot 4.

从零编写游戏引擎教程 Writing a game engine tutorial from scratch

Doom 3 GPL source release

GZDoom is a feature centric port for all Doom engine games, based on ZDoom, adding an OpenGL renderer and powerful scripting capabilities

Replicated and optimized community version of Advanced Locomotion System V4 for Unreal Engine 5.4 with additional features & bug fixes

Godot Jolt is a Godot extension that integrates the Jolt physics engine

LimboAI - Behavior Trees and State Machines for Godot 4

Dear ImGui plugin for Godot 4

Online repo for Gameplay Ability System Course

Modular inventory system for godot 4 with nodes, compatible with multiplayer, separate logic from the UI, Using items as separate resources.

Simple C++ FPS Template for Unreal Engine

Steam Sockets Multiplayer Peer for Godot 4 via GDExtension

The Ultimate Starter Kit plugin to speed up development of Unreal Engine games

Godot Box2D – C++ Godot Extension that integrates the Box2D physics engine.

Easiest way to use Epic Online Services in Godot 4.2+ (EOSG) (includes demo project)

Beginning C++ Game Programming, Third Edition