It's much better than fmud, and mostly written in javascript (uses flash only for the socket connection to the mud but can also use websockets but then you need support from mud server or proxy) as seen here:


http://discworld.starturtle.net/lpc/decafmud/index.html
http://vps.medievia.com/decafmud/


Source is on github: https://github.com/stendec/DecafMUD
and stendec can be found on freenode