MR, currently I am using GMFC exclusively. I tried the others, I even used Jedicut for a few months but GMFC has many more features. Of course it is not free like Jedi but the value was there for me. There is a trial version with full functions so I suggest you try them and see which works for you before you make the investment. I would not waste your time on Foamlinx. I would have a hard time describing the differences as it has been a while since I used anything but GMFC and once you learn the nuances of one package you really won't want to switch.
Download them, try them out and feel free to ask me any questions, it would be easier to address specifics than the entire packages.
Sleedo