What are some alternatives?
When comparing Webmin and CentOS Web Panel, you can also consider the following products
cPanel - With its first-class support and rich feature set, cPanel & WHM has been the web hosting industry's most reliable, intuitive control panel since 1997.
Ajenti - Web administration panel for servers and custom hardware
ISPConfig - ISPConfig 3 is an open source hosting control panel for Linux.
ServerPilot.io - Centralized hosting control panel for Wordpress and PHP web sites
Vesta Control Panel - – What I love about Vesta is that it's fast and easy to use
CyberPanel - CyberPanel is web hosting control which is based on OpenLiteSpeed.