QGroundControl (QGC) is a professional-grade, cross-platform ground control station for MAVLink-enabled unmanned aerial vehicles (UAVs), supporting both PX4 and ArduPilot autopilots. It provides full flight control, real-time telemetry monitoring, mission planning with complex survey/scan patterns, video streaming with hardware-accelerated decoding (D3D, Vulkan, DMABuf), log analysis (ULog, DataFlash), and vehicle configuration wizards. The architecture is a monolithic Qt/C++17 application with a QML-based UI, organized around a plugin system for firmware-specific features, a custom state machine framework for async workflows, and a type-safe Fact system for parameter management. It also includes extensive CI/CD infrastructure, a comprehensive test suite, and support for Android, iOS, macOS, Windows, and Linux. The repository is hybrid in that it contains documentation (vitepress), Python tooling for CI/code generation, and data-oriented log parsers, but its dominant character is a complex desktop/mobile application.