I have a server that I can play with, yes its mine and I host a domain which I will not list now.

What I am trying to do is get some ideas of different software that I can test on this server. Anythinng.

If you have one list the name of it and provide a link of possible.

I am running an apache server.

how about cpanel.net

The account already has cpanel installed

That's great. it only leaves you a few million things to put in.

You don't generally test software by thinking of something to install. you find a reason to use something on the server and install what applications it will need. lik image majic for galleries, zend for zend encoded files, ruby on rails for software written for that, etc.