This is a PERL CMS with loads of features:
http://noahgrey.com/greysoft/

Am I allowed to use it in my Kualo account or it will cause a load on the server?

in the knowledge base there is a list of scripts you can and cannot use...

Hi,

Our current banned scripts list can always be found at:

http://helpdesk.kualo.com/kb.cgi/kb.cgi?view=17&lang=en

We would allow the installation of GreyMatter onto our server, but we monitor load closely. If we felt that the use of this program was negatively affecting the service that other clients were receiving, we would have to ask you to remove it.

Best regards,

Craig.