My art is Modern Arnis but within that Modern we have incorporated many other weapons. Of course we have the rattan sticks but we also have knife, bo, tonfa, sai, kama, jo, and sword forms.
I notice nobody has mentioned things like kubotan, I assume this is because they were limiting discussion to those weapons for which there knew anyos/katas/forms (choose your language).
For the sake of expanding discussion I will add nunchaku and kubotan as weapons we practice for which we do not have set forms. Stick work flows directly into nunchaku.
Way back in the day I also knew a chinese staff/spear form but I have sadly lost that knowledge to the sands of time.