Kontact - Kontact is the integrated Personal Information Manager of KDE.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
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.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.