greytowhite
Green Belt
Yiquan and Ziranmen are the two "formless" styles. That said some of the branches of both have forms. Some of the Han family branch of Yiquan have a "second course" which is basically Hebei xingyi. Many Ziranmen schools also practice Cheng bagua, Liuhemen, or another art beside it. Still, there is a structured curriculum of basic movements and lots of practice with partners etc.