Syncthing is really underrated. Clever, cute little bit of software. Darktable is a bad user experience on the Mac but it's definitely capable of good results,

Syncthing is really underrated. Clever, cute little bit of software. Darktable is a bad user experience on the Mac but it's definitely capable of good results, as is Rawtherapee. But I generally don't use open source stuff for photography; I have sunk expense in Mac software and I'll use that until it breaks.