Lectrote - A portable Interactive Fiction games interpreter application
Mudlet - Mudlet is a freshly-minted MUD client, designed to take mudding to a new level.
TinTin++ - TinTin++, aka tt++, is a free MUD client for Mac OS X, Linux, and Windows.
Text Fiction - Play classic text adventure games like Zork or the Hitchhiker's Guide to the Galaxy on your Android smartphone for free!
MUSHclient - MUSHclient - a 32-bit MU* client
textadventures.co.uk - Create, play and share text adventure games.