Bashupload - Upload files from command line to share between servers
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.
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.