When I tested that the link was still good, my search for Dialog Studio on that site brought up two other matches. While not literally Dialog Studio, they might be worth looking at.
There is a program called Dialog Editor, but I'm unsure where it's available from. In my opinion (and I've stated this many times before) Dialog Studio is superior to Dialog Editor, however, to be fair, some people state that they prefer Dialog Editor to Dialog Studio.
To my knowledge those are the only two Dialog Editor programs available.
Out of curiosity, what is it that you don't like about Dialog Studio?