I'm happy to present Inno Setup Decompiler.
It is tool to greatly simplify analysis of PascalScript compiled byte-code. Inno Setup has this code in [Code] section of a script.
It recovers variables, types/records and Pascal code. Now there are no high-level control flow structures. But it is to be improved later. There is work in progress to significantly improve CodeAnalyzer engine which will help improve decompilation a lot.
Some resulting examples: