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

Bitcoin Core integration/staging tree

Protocol Buffers - Google's data interchange format

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

JSON for Modern C++

LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.

OpenPose: Real-time multi-person keypoint detection library for body, face, hands, and foot estimation

Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.

Abseil Common Libraries (C++)

A high-performance, zero-overhead, extensible Python compiler using LLVM

Event-driven network library for multi-threaded Linux server in C++11

Perceptual JPEG encoder

Frame profiler

Main gperftools repository

C++ websocket client/server library

Complete Open Source and Modular solution for MMO

HybridCLR是一个特性完整、零成本、高性能、低内存的Unity全平台原生c#热更新解决方案。 HybridCLR is a fully featured, zero-cost, high-performance, low-memory solution for Unity's all-platform native c# hotupdate.

Industry-standard navigation-mesh toolset for games

Game engine

Open-source, cross-platform, C++ game engine for creating 2D/3D games.

Light-weight, simple and fast XML parser for C++ with XPath support

Node Editor built using Dear ImGui

3D C++ Game Engine - yet another open source game engine

MIT Licensed Open Source version of Torque 3D from GarageGames

Viewer and exporter for Unreal Engine 1-4 assets (UE Viewer).

nanobind: tiny and efficient C++/Python bindings

High-performance C++ multibody dynamics/physics library for simulating articulated biomechanical and mechanical systems like vehicles, robots, and the human skeleton.

miniz: Single C source file zlib-replacement library, originally from code.google.com/p/miniz

A small, dependency-free node editor for dear imgui

A fast and flexible implementation of Rigid Body Dynamics algorithms and their analytical derivatives