Looking for RPG games with private servers

As the title explains I'm looking for a RPG game where you can host your own private server. Something like Spiral Knights but with private server. Preferably free games :D

I think you can with Planeshift

Project 1999 maybe. There's also some free World of Warcraft private servers. Those two are diligently moderated and the teams running them are good people. No need for your billing information.

Non of them are what I'm looking for :( But still thx guys!