computes an arrow's trajectory given its initial velocity and other parameters. The program calculates the velocity, position, and kinetic energy of the arrow as it flies to its target. Air friction continually slows the arrow as gravity eventually brings it down.
You can change the initial velocity, arrow weight, arrow length, and other factors, and see how your arrow flies.
You can move your target to various distances, and shoot to see where your arrow would hit and with how much energy.
In addition, Arrow Pro lets you estimate the speed of your bow.