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MIT NetIdMgr (1.3.0.0)
Available as part of http://web.mit.edu/kerberos/dist/index.html#kfw-3.2
PuTTy (0.58 with GSSAPI extensions)
There are many versions of putty which claim to have GSS extensions, but the only one I had success with is this one: http://www.sweb.cz/v_t_m/putty/PuTTY-0.58-GSSAPI-2005-07-24.zip