r.ros(1grass) on Linux
The text 417d861cbfb9, as Debian 12 (Bookworm) shipped it.
Generates rate of spread raster maps. Generates three, or four raster map layers showing the base (perpendicular) rate of spread (ROS), the maximum (forward) ROS, the direction of the maximum ROS, and optionally the maximum potential spotting distance for fire spread simulation.