Given how often gmud is mentioned here - I should recommend donclient - which tries to combine the free nature of gmud with the actually being a good mud client of mushclient, zmud, etc.
Currently MSP support is in the works - with MXP to follow.
Ofcourse I wrote it, so I am a little biased, but I'd say its easily the best free mudclient I've seen.
Don't be alarmed when it automatically connects you to DoN when you first start it up - you can change the connection details in settings to your favourite mud.
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