Share 'Relationship calculator that uses a GEDCOM'

I was a Family Tree Maker user for ages, but I stopped upgrading around version 8 or so. Having switched to the Mac in 2006, I've finally upgraded to a Mac-native software package (MacFamilyTree) instead of running FTM in a virtual machine. One thing I miss from FTM is the "relationship calculator" where you can select two individuals and the software will display how they are related (14th grea…