This presentation will describe the current concepts of the ReaxFF method, the current status of the various ReaxFF codes, including parallel implementations and acceleration methods. Also, we will present and overview of recent and past applications to complex materials, including the synthesis of carbon fibers [3] and carbon nanotubes [4], applications to perovskite based ferroelectric materials[5], cold sintering of complex oxides [7] and recent developments for expansion of ReaxFF for events that require explicit electrons (e-ReaxFF) [7].