Google Contacts - 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.
Addme - All your social pages in one place
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
PING - PING (Partimage Is Not Ghost) is a free software Linux-based live CD ISO built upon the partimage...
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.
Okapi Framework - A cross-platform framework for localization annd translation tools.