Below a description of useful applications for an enterprise. The configurations are for small organisations with only a few users. See the Hannibal namespace for a set of configurations built around an LDAP-userdatabase. Each module lives in its own Debian server, probably a virtualized one.

• storage: fileserver (samba/nfs).
• e-mail: mail-transfer-agent (mta) + mailstore.
• calendar- and addressbook-server for caldav carddav.
• XMPP-server, chat, presence, ZRTP-secured (video)-calling, file transfer.
• SIP-VoIP telephony-server.

• webaccess roadwarrior: Roundcube-webmail, CalDavZap-webcalendar, CardDavMate-webcontacts.
• fullaccess roadwarrior: OpenVPN-server.

• OwnCloud-server.
• calendar + addressbook.

• build an RBL-service