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.
Docker Hub - Docker Hub is a cloud-based registry service
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Affinity - Relationship Intelligence, Reimagined
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.