Baïkal is a server for CalDAV and CardDAV. Currently I'm working on switching over from Radicale, which has problems with eating everything in my address book, and syncing with Android (though both those things worked fine in the past :/

Been having trouble connecting the address book to Thunderbird (but I also had trouble with Radicale).

These are supposedly the URLs you use:

• https://[server]/baikal/cal.php/calendars/[username]/[calendar]/
• https://[server]/baikal/card.php/addressbooks/[username]/[addressbook]/