Best open-source C++ projects

Runs the 125B-parameter Qwen3.8-Flash-Next model on a consumer NVIDIA or AMD GPU PC, exposing OpenAI- and Anthropic-compatible APIs on localhost.

Unreal Engine 5 plugin that connects games and editor tools to LLM, image, TTS and 3D generation APIs, plus an MCP server for AI-driven editing.

An MIT-licensed Unreal Engine 5.8+ plugin that extends Unreal's native MCP server so AI agents like Claude Code and Cursor can drive the editor.

An MCP server and native C++ Unreal Editor plugin that lets AI assistants build levels, Blueprints, materials and more inside a running Unreal Editor.

A cross-platform C++ image and video filter library that runs on OpenGL/ES, with beauty filters for iOS, Android, Mac, Windows and Linux.

Qt-based desktop client that displays and controls Android devices over USB or Wi-Fi without requiring root.

A GPU-over-IP bridge that lets CPU-only machines use GPUs installed on remote servers over the network.

Native database IDE for macOS, Windows, and Linux covering PostgreSQL, MySQL, SQLite, Redis, MongoDB, SQL Server, and ClickHouse, with a built-in MCP server and AI chat.

A tiny C++ library for sending small amounts of data between devices using sound, with Python, JavaScript and Arduino bindings.

Framework for building cross-platform desktop apps with JavaScript, HTML, and CSS, based on Node.js and Chromium.

Open-source document scanner app for Android and iOS, built with NativeScript, with OCR via Tesseract and image processing via OpenCV.

A C++ video analysis framework built as a pipeline of independent nodes, for running CV models and multimodal LLMs on video streams.