MMORPG Game Engines
I'm planning to develop a MMOG (Massively Multi-player Online Game). First, I know the challenges, both financial and technical to get such a game rolling. 
I'm looking for a Game Engine to develop the same. It would be better if I can select a Free Open Source (FOSS) game engine, because that way I can even add to the game engine stuff that my game needs but is not present in the engine. Firstly, there are very few FOSS game engines for MMOGs. If there are no good FOSS engines, I'll have to compromise and settle for those proprietary engines. 
To summarize, I'm looking for:
1. A stable and established Game Engine for making a MMOG.
2. Preferably, the engine should be under an Open Source License.
3. Should include the latest in Web Technology (HTML 5, CSS 3 etc)

Engines that I've been suggested:
1. Eclipse
2. DimensioneX

I've also looked at devmaster.net , but it's giving me too many options and it's hard to choose between them. 

Also, Mozilla has developed an online game recently called Browser Quest. It's an Open Source game,  and they've said they've the latest technology imbibed. So I thought I could take their engine and use it for my purpose, but it's brand new and not established as such, so I had my doubts about using it when it is at such a stage.


MMORPG Game Engines
===

I'm planning to develop a MMOG (Massively Multi-player Online Game). First, I know the challenges, both financial and technical to get such a game rolling. 
I'm looking for a Game Engine to develop the same. It would be better if I can select a Free Open Source (FOSS) game engine, because that way I can even add to the game engine stuff that my game needs but is not present in the engine. Firstly, there are very few FOSS game engines for MMOGs. If there are no good FOSS engines, I'll have to compromise and settle for those proprietary engines. 
To summarize, I'm looking for:
1. A stable and established Game Engine for making a MMOG.
2. Preferably, the engine should be under an Open Source License.
3. Should include the latest in Web Technology (HTML 5, CSS 3 etc)

Engines that I've been suggested:
1. Eclipse
2. DimensioneX

I've also looked at devmaster.net , but it's giving me too many options and it's hard to choose between them. 

Also, Mozilla has developed an online game recently called Browser Quest. It's an Open Source game,  and they've said they've the latest technology imbibed. So I thought I could take their engine and use it for my purpose, but it's brand new and not established as such, so I had my doubts about using it when it is at such a stage.

