http://www.users.interport.net/~pbrooks/slipknot.html

SlipKnot is a Windows-based
graphical WWW browser that does
not require SLIP, PPP, or TCP/IP.
Designed for users of UNIX dial-up
or direct connect shell accounts,
SlipKnot has a number of features
included specifically for serial
communications users. 

Minimum requirements:
UNIX dial-up account.