What is the crowd's opinion of ZPanel?

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I had a look at the Zpanel website and struggled to work out what it actually did. Apparently

ZPanel is a free to download and use Web hosting control panel written to work effortlessly with Microsoft Windows and POSIX (Linux, UNIX and MacOSX) based servers or computers. This solution can turn a home or professional server into a fully fledged, easy to use and manage web hosting server.

A little more detail about what you have in mind would be useful. Speaking off the cuff I'd say that yes you can use Zpanel on a RasPi but it will only support the very lightest of loads.

The above wasn't for cPanel, cPanel costs $200 yearly, price is here for monthly and etc. http://cpanel.com/pricing/

I was explaining above how to set up something you have on a LAMP/LEMP stack without cpanel, and you later can set up something like http://www.zpanelcp.com/ http://www.webmin.com/

the distro is installed for you when you choose LEMP 14.04 it is ubuntu 14.04

>but rather a simple application that could manage many server services with ease

These are called control panels. The most popular is cPanel, but there are lots of free alternatives like zPanel.