It's been a while since I looked at these, but... There are server emulators that allow to varying degrees of success running your own server. Most require a retail copy of the game, and some type of patch to access the unofficial server. Run a couple of google searches - "ultima online server emulator" for example. Also I remember hearing about a DAoC emulator being released sometime.
A couple of quick searches revealed:
http://www.coadserver.com/ - A DAoC emulator
http://www.smithysanvil.com/ - MMOG Emulators & MMORPG News & Uncensored Rants.
- Seems to have lots of emulator information and forums to get your going.
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