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.
BrainFlow - Uniform SDK to work with biosensors and neurointerfaces
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
HeadsUp Sensor and Analytics - Athlete sensors and predictive analytics for athletes
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.
NextVein - High-performance vein finders at an affordable price