Protocol Buffers - Google's data interchange format

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

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

GoogleTest - Google Testing and Mocking Framework

Fast C++ logging library.

FlatBuffers: Memory Efficient Serialization Library

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Hazel Engine

The POCO C++ Libraries are powerful cross-platform C++ libraries for building network- and internet-based applications that run on desktop, server, mobile, IoT, and embedded systems.

C++ implementation of the Google logging module

Firebase SDK for Apple App Development

free C++ class library of cryptographic schemes

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

LimboAI - Behavior Trees and State Machines for Godot 4

The Stratagus strategy game engine

Variational Bayes for High-Dimensional Survival Analysis https://arxiv.org/abs/2112.10270