Convert CMYK values to Pantone
CMYKtoSPOT is a amall App to convert CMYK color values to Pantone colours. (It's not perfect and not 100% correct). But if you don't have the Adobe applications installed it can help.
I found the download link here:
It seems that there is no official website for the developer... at least I did't find it.
From the readme-file:
"To exit the program, click on the Pantone banner, this will open your browser and then you can quit"