GNOME Contacts is described as 'Contacts keeps and organize your contacts information. You can create, edit, delete and link together pieces of information about your contacts. Contacts aggregates the details from all your sources providing a centralized place for managing your contacts' and is a Contact Manager in the office & productivity category. There are more than 10 alternatives to GNOME Contacts for a variety of platforms, including Linux, Web-based, Windows, Mac and iPhone apps. The best GNOME Contacts alternative is Google Calendar. It's not free, so if you're looking for a free alternative, you could try Google Calendar or SeaMonkey. Other great apps like GNOME Contacts are Kontact, Nextcloud Contacts, Calendar Buddy and Osmo.