Optimal Reciprocal Collision Avoidance in Three Dimensions (C++)

ExcelFormat library from CodeProject

High performance build system for Windows, OSX and Linux. Supporting caching, network distribution and more.

Prefabricator - Prefab plugin for Unreal Engine 4 https://prefabricator.dev

A popular .NET WebSocket Client

SuperWebSocket is a .NET implementation of WebSocket server.

Flexible level editor

一个优雅的开源跨平台3D引擎，包含Foundations，3DMAXPlugin，Editor，支持Windows，Android，IOS平台的软件开发，现已呈现。QQ交流群：336273110

Utility library in C++ (containers, memory management, inter-process communication)

C++ Game Engine (Under Construction!)

Android++ -- A native development and debugging solution for Visual Studio.

2D skeletal animation runtimes for Spine.

A retro isometric visualizer for Dwarf Fortress

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

Game engine for cross-platform

Smart-3D engine