While I was working on getting my EQEmu to work, I ran across a Lineage 2 emulator that was fairly easy to get up and running. Two good websites to get you started are:
http://l2j.jot.com/WikiHome
http://forum.l2jserver.com/
It's java based, and wasn't all that hard to setup. It's easier to get the L2 client versions to be the same as well. Longest part was actually downloading the L2 client, which runs about 2GB.
Also had a WoW emulator running, but it was really hard to find the software; Blizzard has evidently really been cracking down on those.
Edit:
I also had a DAoC emulator running, but I couldn't get the quests to work, or the mobs to drop items, and I gave up on it when I found the L2J server. You can find most of the info for it at:
http://dol.psykonikcorp.net/
and the databases can be found at:
http://www.doldata.fleetingclarity.com/
I know that someone is working on a FFXI emulator, but haven't been able to locate much information on it yet.