I was wondering if there is any sort of webbased serve management (cross-platform) for much much like cPanel, that's intsllation is (preferrably) free and easy?
Your question is hard to understand. cPanel is usually used to control your email, php, cgi, specs, server settings, joomla installation, add-on domains, etc.... when you are using a web hosting provider. It is used to allow the customer to access their settings via a web browser so they can customize their account. Example, anhosting
http://www.anhosting.com/ uses cPanel for there customer interface.
Most web based email like yahoo, google, msn, etc..., allow the customer to customize via there own interface which is like cPanel.
If you are going to run your own server, you can customize OS X Server to have an web based interface via the web browser for customers.
As far as web based email servers, Zimbra is a good option
http://www.zimbra.com/community/downloads.html I have not used this myself but I am sure they have c-panel like features if not c-panel itself.
You can also look at Faraway Mac for some other resources
http://www.farawaymac.com/
Again, your question is hard to understand so If I am way off sorry.
