Sync Cloud Contacts on Android

With Sync Cloud Contacts on Android you can transfer from iPhone to Android and still use iCloud services. iCloud Contact Sync for Android is a CardDAV client to synchronize contacts in iCloud Server by using your Apple Id. By using this app, you can continue using iCloud Contacts services on both Android and Apple devices. It also supports 2-steps verification.

Sync your calendar with the solar system

From NYtimes.com: Sync your calendar with the solar system. Photo copyright: Robert Simmon, NASA.

The New York Times astronomy and space calendar

From TheVerge.com: The New York Times astronomy and space calendar.

Making any Mac into a calendar and contacts server

From ronregev.com: Making any Mac into a calendar and contacts server.

How to set up the Calendar Service in macOS Sierra Server

From Macworld.com: How to set up the Calendar Service in macOS Sierra Server.

iHub Basic

From Macupdate.com: iHub Basic lets you share contacts and calendars in your local network-it's wireless and automatic for less than 30$.

Making any Mac into a calendar and contacts server

From ronregev.com: Making any Mac into a calendar and contacts server.