Sharing contacts with another Mac

Both my wife and I have two MBPs and separate iCloud accounts.

I want the contacts on both of our Macs to sync and be shared.

We used the Fruux server  with BusyContacts, but it has been a while since this server has stopped working.

I want all of our contacts to be same throughout our iPhones, desktop computers, laptops, and iCloud, displaying any modifications made to any of them.

Does anyone know of a way to do that?