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

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.

SRS is a simple, high-efficiency, real-time media server supporting RTMP, WebRTC, HLS, HTTP-FLV, HTTP-TS, SRT, MPEG-DASH, and GB28181.

Cloud-native high-performance edge/middle/service proxy

FlatBuffers: Memory Efficient Serialization Library

SQL powered operating system instrumentation, monitoring, and analytics.

Lightweight, Portable, Flexible Distributed/Mobile Deep Learning with Dynamic, Mutation-aware Dataflow Dep Scheduler; for Python, R, Julia, Scala, Go, Javascript and more

A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)

ONNX Runtime: cross-platform, high performance ML inferencing and training accelerator

A fast, distributed, high performance gradient boosting (GBT, GBDT, GBRT, GBM or MART) framework based on decision tree algorithms, used for ranking, classification and many other machine learning …

Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit

A fast and easy-to-use status bar

A fast JSON parser/generator for C++ with both SAX/DOM style API

Dear PyGui: A fast and powerful Graphical User Interface Toolkit for Python with minimal dependencies

Approximate Nearest Neighbors in C++/Python optimized for memory usage and loading/saving to disk

Tiny cross-platform webview library for C/C++. Uses WebKit (GTK/Cocoa) and Edge WebView2 (Windows).

cross-platform (Qt), open-source (GPLv3) video editor

a small build system with a focus on speed

Clipboard manager with advanced features

Multipass orchestrates virtual Ubuntu instances

The Fast Cross-Platform Package Manager

OpenVR SDK

Immediate Mode Plotting

A cross-platform file change monitor with multiple backends: Apple macOS File System Events, *BSD kqueue, Solaris/Illumos File Events Notification, Linux inotify, Microsoft Windows and a stat()-bas…

Create charts from the command line

Ultra fast JSON decoder and encoder written in C with Python bindings

Modern VNC Server and client, web based and secure

Automatic PageSpeed optimization module for Nginx