Eclipse is a free 2D game engine which can be used to make MMORPG's. Eclipse is fairly simple to use once you get the hang of it, though the newest version is still being worked on so it does have some bugs.

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Here are some creenshots of a test game I was making to see what all you could do with Eclipse.
Screenshot 00 : (I know, 'begins' is spelled wrong. But that was the creators of Eclipse, not me!) The client is the window at the top, and the server is the one at the bottom left. On the bottom right is the admin panel.
Screenshot 01 : If your access is high enough, you can press F1 when the client is open to bring up the Admin Panel. Using this, you can edit maps, npcs, items, skills, etc. Just like the Database in the RPG Maker client.

About the Server:
If you've ever played an online game, you'll know that they run on servers, and in order to actually play the game, you need to download the client. Eclipse is just like this as well. If the server isn't running, you can't log into the game using the client.

In the 'Chat' tab of the server, you can make custom messages, as well as see what's being said on certain maps.
In the 'Player's' tab, you see a list of all accounts currently online, which character they're playing, their level, which sprite their character is set too, and their access (basically, are they just a member, or an admin, mapper..etc). You can also kick, ban, jail, kill, heal, warp, change access permissions and a few other things just from this tab alone.



*This will be edited later to include more information.