Im not sure if this is the best part of the forum to post this but...

I am trying to setup a couple of PC's in my home that i can learn about hacking on but im not sure what servers and versions of said servers i should setup on the computers to hack.

Both computers will be running linux, any sugestions as to wich servers for example web servers, ftp servers and mail servers etc that i could run exploits and such against would be very welcome.