Recommendation for genealogy software for OS X?
I haven’t found one that interfaces with the website you mentioned, but here’s a good overview of genealogy software for OS X: http://www.macgenealogy.org/mac-genealogy-software/

MacFamilyTree 6 is actively developed (it was just updated a few days ago), is fully GEDCOM-compatible, and it has an iOS version too!



It doesn’t export to ancestry.com but it can interface with a custom-built website called MacFamilyTree.com.