Welcome to theos.kyriasis.com
Theos is a server under the kyriasis domain owned and operated by kyrias, who also owns kyriasis.com itself (albeit not the server that the A record on kyriasis.com points to for historical reasons.)
The server hosts an HTTP server running NGINX, an LDAP directory running OpenLDAP, email services using OpenSMTPD and Dovecot, Kerberos using MIT Kerberos and the LDAP backend for storage, and Git hosting using a combination of cgit and a slighly modified version of gitolite and OpenSSH to enable Kerberos authentication.
All users with shell access have the option to get an email under the kyriasis.com domain, web hosting under the theos.kyriasis.com domain or possibly under a custom subdomain, and git hosting. (All git push access is done using Kerberos authentication.)