Has anyone played
http://www.shartak.com/ online?
It's interesting. There's no plot or story, but the world map is of a massive island. Simple graphical layout.
Different types of users (cannibals, pirates, island natives, outsiders) with different character classes (medics, scouts, warriors, scientists, etc.) The terrain is jungle, beach, grassland, swamps, mountain, caves, water, deep water, etc. There are animals roaming around: elephants, monkeys, rats, bats, rhinos, alligators, birds, silverbacks, and more. Various weapons and items to acquire.
While simple, it's worth a look. I have a character playing as an "outsider" of a village called "York", if you end up joining.
I've been experimenting with databases online, and could see Overkill (or a new game!) ported over to a web-browser.