Tkinter layout designer

[mm0fmf]

Can anyone recommend a graphic layout designer for Tkinter programs. I 
have a number of older C# Windows Forms apps that need porting so they 
can run on Linux and Windows and this is the chance to re-write them in 
Python. However, after using the forms designer in Visual Studio, 
manually coding up the widget positions etc. is a real pain in the 
backside.

So please, recommendations for a designer that is usable and functional 
please to save me working through everything a Google search throws up.

Thanks,
Andy