each Univention server includes a web server by default (Apache 2). It is used for the administration of the system but can be used for other purposes, too, of course.
Univention also provides an FTP server. You can install the package »univention-ftp« which depends on the well-known ProFTPd server. The »univention-ftp« package itself provides an integration of the ProFTPd configuration into the UCS management.
Of course Univention itself is based on Debian, and Debian includes several other FTP servers like vsftp. You can install those, if you like, but those are not managed by UCS.