Open Contacts - Open Contacts is an advanced address book program for managing contact info of individuals and...
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.