Programs
I have Segmented project planner, Woodturner pro, and Woodturner's Studio. They are all good. I like them all as each has a different strong point. I tend to use Woodturner's studio first but I also like a lot of the features in segemnted project planner. With woodturner pro you also need the 3d design program to make it work like the studio. SPP(segmented project planner) is really nice for designing the feature rings.
Vernon