Below are some screenshots taken from Webmin, using an older theme :
The list of Unix users from the Users and Groups module
Creating a Unix user in the same module
Listing mounted filesystems on Linux
Managing NFS exports on a Linux system
Editing disk quotas for a Unix user
Viewing local disk partitions on Linux
Editing a system bootup script which starts Apache
Viewing running processes
Viewing the details of an installed RPM package
Managing system log files
Editing the details of a network interface
Adding a Linux firewall rule
Setting the system time and timezone
Adding a new printer using CUPS
Listing installed Perl modules
Setting up disk space monitoring
Editing the configuration of an Apache virtual host
Managing records in the DNS domain
Configuring a DHCP server
Managing tables in a MySQL database
Managing databases in a PostgreSQL server
Viewing Sendmail email aliases
Configuring an SSH server
Sharing a new directory to Windows clients with Samba
Configuring network settings for the Squid proxy server
Creating a new Procmail email filtering rule
Webmin configuring itself!
Creating an extra Webmin login with limited permissions
Setting up a scheduled backup
Configuring a system to talk to an LDAP server
Managing users in an LDAP database