VESC Tool is a cross-platform Qt/C++ desktop and mobile application for configuring, monitoring, and updating VESC (Vedder Electronic Speed Controller) devices. It provides a rich interface for firmware flashing, motor parameter detection (BLDC, FOC, hall sensors, encoders), real-time data visualization (currents, RPM, temperatures, IMU), data logging with GPS and map overlay, LispBM and QML scripting, and communication over serial, TCP, UDP, BLE, and CAN bus. The architecture is a monolith with a central VescInterface class handling all communication and configuration, and around 30+ UI pages dedicated to specific functions. It also includes a suite of reusable components such as a parameter configuration system, binary serialization utilities, code and markdown editors, and digital signal processing filters. The tool is actively maintained with support for multiple hardware versions and a growing ecosystem of third-party firmware and scripts.