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

Open Source Computer Vision Library

Protocol Buffers - Google's data interchange format

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

JSON for Modern C++

C++ based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)

GoogleTest - Google Testing and Mocking Framework

A library that provides an embeddable, persistent key-value store for fast storage.

An open-source C++ library developed and used at Facebook.

Fast C++ logging library.

Apache Thrift

COLMAP - Structure-from-Motion and Multi-View Stereo

Reliable & unreliable messages over UDP. Robust message fragmentation & reassembly. P2P networking / NAT traversal. Encryption.

A simple C++11 Thread Pool implementation

Crow is very fast and easy to use C++ micro web framework (inspired by Python Flask)

OpenVR SDK

open Multiple View Geometry library. Basis for 3D computer vision and Structure from Motion.

Open Source H.264 Codec

Doom 3 BFG Edition

ARCore SDK for Android Studio

A client library for the Arduino Ethernet Shield that provides support for MQTT.

open Multi-View Stereo reconstruction library

LUX - Hybrid PoW/PoS & Unique PHI2 Algorithm | Masternode | Parallel masternode | Segwit | Smartcontract | Luxgate | Proof of file storage (Decentralised distributed file storage)

Protocol Buffers implementation in C

Facebook's branch of Apache Thrift, including a new C++ server.

Fast Library for Approximate Nearest Neighbors

Modern and efficient C++ Thread Pool Library

C++ library for zkSNARKs

Redis client written in C++

Dear ImGui backend for use with SFML