The Radicale Project is a complete CalDAV calendar server solution. It can store multiple calendars.

Calendars are available for both local and remote access, possibly limited through authentication policies. They can be viewed and edited by calendar clients on mobile phones or computers.

Sockso is a free, open-source, personal music server for everyone! It's designed to be as simple as possible so that anyone with a mouse and some mp3's can get their friends listening to their music across the internet in seconds!