FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Median.co - Median.co (formerly GoNative.io) is the industry leading solution used to build iOS and Android webview apps. Get started for free and turn any website into a full-feature mobile app in seconds.
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.
Convertify - Convert your website to an iOS and Android app
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.
appenguin - Turn the most complex web application or website to into an Android app in minutes, for free!