My vote goes to MachScreen. I used it the other day for the first time and found it very intuative and the layout is simple, very similar to the Visual Basic development software I sometimes use where you have a window sidebar selection to change the properties.
Only two annoyances I found, The dropdown box for the selection of Mach screen page. With the previous version it worked ok, I downloaded and install the latest version
and found the box does not dropdown so you have to click the scroll until your numbers there and then select.
The other thing happened with both versions, on saving the file I get a errorbox with filename name or directory name syntax wrong but it saves ok.
All in all, It works without weird things happening and you can make changes to you screen easily.