This small personal server is using Free and Open-Source software to provide these two services :
|✔||CalDAV and CardDAV, powered by Radicale|
XMPP Communication server, powered by Prosody
Register yourself here if you're a bot, and here if you're a human : ./register_web
If you're interested with an account in either service, drop me an e-mail at admin at nikel.me.
All of this is running on a server powered by Devuan