adx - addressbook.xml is described as 'adx is a minimalistic but massively web enabled address book running completely in your browser. How it works: addressbook.XML + XSLT = HTML in your web browser' and is an app in the Office & Productivity category. There are more than 10 alternatives to adx - addressbook.xml for a variety of platforms, including Windows, Online / Web-based, iPhone, iPad and Android. The best alternative is Google Contacts, which is free. Other great apps like adx - addressbook.xml are Contacts+ (Freemium), Kontact - KAddressBook (Free, Open Source), Contacts (Paid) and CircleBack (Free Personal).
Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
It supports large variety of services, including NextCloud, Kolab, Google Contacts, Microsoft Exchange (EWS) or any standard CalDAV server. Features: Powerful search - KAddressBook has configurable filters and powerful search capabilities.
Contacts is a flexible and convenient place to store information for everyone you know. It’s easy to import names, numbers, addresses, and photos from Facebook, LinkedIn, Google, and even Microsoft Exchange.
E-Z Contact Book is a free easy to use yet powerful Windows program to store and manage contact information. You can use it as a business directory, customer database, or a personal contact address/phone book.