Yes, UF can open, use and convert MAP files.
I have now tested,
you can't use a UGR file in Chaoscope.

But I think I have maybe found a way around it.
Open the UGR file in a text editor
Select the gradient you want to use
Paste the selected text into a new text file
Name it with the MAP extension
Start up WinFract
Load the new MAP (Colors => Load Color-Map...)
Save the color map (Colors => Write Color-Map...)

/Hubbabub