ManageEngine SupportCenter Plus - SupportCenter Plus is a web-based customer support software that lets organizations effectively manage customer tickets, their account & contact information, the service contracts and in the process providing a superior customer experience.
BusyContacts - BusyContacts is a contact manager for macOS.
Google Cloud Console - Use Cloud Console to manage everything powering your cloud application: data analysis, VMs, datastore, databases, networking, and developer services.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Zoho Desk - Industry's first context-aware Helpdesk Software
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.