Server for MMO RPG Web based game

Hi
We are planing to develop mmo rpg game using unty. Unity part we can handle, but we have problem with server.
We have our own dedicated server (for www, ts3 etc). Is there any server that can be instaled on dedicated server?
I found that lot of ppl sugest to use Photon.
Is there any good alternative?

Thanks for Your Help

Well you can write your own in C#/JAVA/C++, that might be the best solution.

YOu might be interested in the thred in this forum entitled HLL WebSockets with Unity
http://forum.unity3d.com/threads/199948-HLL-WebSockets-with-Unity

You can also check out AppWarp. It is a BaaS service and also supports unity. http://appwarp.shephertz.com/

if you know java or want to learn it check out my very noobish failed work at trying to make a java based server on github.
https://github.com/chrisx84/BloodBathServer

If you know Java, I would highly recommend using that to write the central server.

My setup that I am working on right now uses a Java server which manages everything, and can launch Uniy instances in headless and nographics modes for each instance that I need.

SmartFox 2X server

There are many solutions available other than the option of coding it yourself.
unityPark (good if you need unity instances on the server to handle logic with physics and …)
photon good if you want .NET C# based plain servers
electrotank / smartfox good if you want java based server logic
badumna

I’d recommend going with the Photon Unity SDK (http://exitgames.com/) it’s really easy to use.