Medieval Battles was a browser based MMORPG that ran from 2002 until sometime in 2007. It was a lot of fun, but was plagued by my overall lack of experience with programming (I taught myself how to program through it) and managing a community.
It's now open source. The database is mostly there though you might run into some issues with a table (or two) or data missing.
I've thought about reviving it, but just haven't had the time.
If you spin up an instance, I'd love to hear about it.
— Jon Ursenbach, 2016