Mark Alldritt: Script Debugger Retired:

The day has finally come. After 30 years of continuous development, Script Debugger has been retired and will no longer be available for sale. Please see this post for more information.

I just looked up when I made my first purchase of Script Debugger — version 4.5 in 2009 for $199, and it was worth every penny.

I still use Script Debugger to this day.

30 years of development is a long time, and Script Debugger is such a great app. Congrats Mark - you made something awesome.