There aren't too many to choose from (which is a shame). The one's Cathe does have are quite fun IMO.
She has two kickboxing workouts, Cardio Kicks and CTX Kickboxing. I don't have Cardio Kicks. I do have CTX Kickboxing and I really enjoy this one. It really gives a great workout in a short amount of time.
I believe that Bootcamp from the Intensity Series is another nonstep workout. You might want to check the website just to be sure. This is another one I don't have and have heard lots of positive things about.
I believe that's it. Of course, most all Cathe's weight videos only use the step as a bench. I think a lot of those moves can easily be done on the floor with a pillow between the shoulder blades. I know that Muscle Endurance only uses a high step (I use my FL) and the rest of the weights are either standing, seated, or on the floor.
HTH,