This article is from the FAQ, by with numerous contributions by others.
Troy Rollo's Twinsock is a freeware alternative to TIA. Unlike TIA,
Twinsock includes both a host program to be placed on your shell
account and its own special stack. Setup can be easier than TIA,
since the stack requires no special configuration. Note that Twinsock
will work even without an 8-bit clean connection, though the 6-bit
mode is slower.
See the FAQ (under More Information, below) for information about
FTPing the latest compiled versions for various hosts. You must FTP
the complete package (see below) to obtain the required stack, which
is compiled. Source code for the host program and the stack is