An Open Source Machine Learning Framework for Everyone

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

The new Windows Terminal and the original Windows console host, all in the same place!

Bitcoin Core integration/staging tree

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

Protocol Buffers - Google's data interchange format

JSON for Modern C++

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

The Serenity Operating System 🐞

Windows Calculator: A simple yet powerful calculator that ships with Windows

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

Scalable, Portable and Distributed Gradient Boosting (GBDT, GBRT or GBM) Library, for Python, R, Java, Scala, C++ and more. Runs on single machine, Hadoop, Spark, Dask, Flink and DataFlow

FlatBuffers: Memory Efficient Serialization Library

A modern formatting library

Abseil Common Libraries (C++)

Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics

NoSQL data store using the Seastar framework, compatible with Apache Cassandra and Amazon DynamoDB

Convert HTML to PDF using Webkit (QtWebKit)

ArduPlane, ArduCopter, ArduRover, ArduSub source

Drogon: A C++14/17/20 based HTTP web application framework running on Linux/macOS/Unix/Windows

Google's Operations Research tools:

The official Open-Asset-Importer-Library Repository. Loads 40+ 3D-file-formats into one unified and clean data structure.

Automatic License Plate Recognition library

Apache Thrift

ZeroMQ core engine in C++, implements ZMTP/3.1

Record and Replay Framework

openFrameworks is a community-developed cross platform toolkit for creative coding in C++.

Algorithm and data structure articles for https://cp-algorithms.com (based on http://e-maxx.ru)

MAME