I have a VPS running CentOS and already have Apache/MySQL installed. I want to install some control panel but it seems all of them include Apache, MySQL and some other softwares that I don't really need. Is it possible for me to install a control panel without installing those softwares?
Yes, WebMin does not require Apache or MySQL. It runs using Perl and creates its own Perl web server on port 10000. You can administer Apache and MySQL with it.
By the way, you can use
yum update and
yum search and
yum install as a 'command line control panel'. It can handle a lot of what you may need.