Convenient contact management software?

Question

Contacts

Hello.
I am looking for some software (MacOS) or some kind of system for a server in which you can collect contact data and synchronize them with each other. That is, I mean that I can connect accounts from social networks, different mails, import the phone book, messengers and I can combine contacts. And storing contacts is not on some cloud or third-party service, but locally on my computer or my own server.
No matter how much I searched, I didn't find anything. Who will tell you a convenient contact management program?

Answer 1

google ?