baikal caldav server
Baikal is a Caldav/CardDAV server which is simple to install and compatible with OSX apps. It is a good choice if you want to run your own server. The latest stable version is 0.27; a 2.0 version has been in the workings for a while.
The URLs of the calendars can be found on the web-interface: look for the Calendar token ID, which is either default or a long alphanumeric string.
There is no downloadable ics that I am aware of.
Use a text editor to open config.js in CalDavZAP's main directory.