Apps with 'Address book integration' feature

Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

The top contact management platform for professionals, teams and small businesses. Sync, deduplicate, enrich, & more. Effortlessly manage your address book contacts with Contacts+.

Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.

PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP). You need an internet connection and an account from a provider supporting the SIP protocol.

Keep track of friends, family and colleagues you care for.

Todo Pro is your personal assistant and ready to help you get stuff done. Todo comes with powerful tools to tackle everything from "honey-dos" to important work projects.