PROS is a lightweight and fast alternative operating system for the VEX Cortex Microcontroller. It features multitasking, low-level control, and Wiring compatible functions to harness the full power of the Cortex. With a real-time kernel based on FreeRTOS (http://www.freertos.org) and a development environment built on Eclipse CDT (http://www.eclipse.org/), PROS uses proven software to increase the reliability and usability of the VEX development system across all three major computing platforms.