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

Piccolo (formerly Pilot) – mini game engine for games104

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

An ecosystem of tools for Godot Engine and Valve's Steam. For Linux, Mac, and Windows.

A high performance, editable terrain system for Godot 4.

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

LimboAI - Behavior Trees and State Machines for Godot 4

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

Dear ImGui plugin for Godot 4

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

Steam Sockets Multiplayer Peer for Godot 4 via GDExtension

Unofficial Epic Online Services wrapper for Godot Engine 4.2 (EOSG) (includes demo project)

Beginning C++ Game Programming, Third Edition