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Discworld MUD
(discworld.starturtle.net)
A community for all things related to the Discworld series of books by Sir Terry Pratchett.
It's a MUD, so you can connect via a MUD client :
https://discworld.starturtle.net/lpc/playing/clients.html
Otherwise, it uses a JavaScript client to play by default:
https://discworld.starturtle.net/lpc/decafmud/web_client.html
Neither appears to be flash (alas for those great days!)