MacSSH is a modified version of BetterTelnet with SSH2 support.
Copyright © 2000 Jean-Pierre Stierlin
Based on BetterTelnet, Copyright © 1997-1998 Rolf Braun
Based on lsh, Copyright © 2000 Niels Möller
Based on GUSI, Copyright © 1992-2000 Matthias Neeracher
LSH IS A WORK IN PROGRESS. IT WILL NOT PROVIDE ANY SECURITY ON SYSTEMS THAT LACK /dev/random. THERE MAY BE OTHER SERIOUS BUGS THAT MAKE IT TOTALLY INSECURE.
I like the Macintosh, and I needed to access Linux boxes through Internet securely.
The only SSH2 client for MacOS I could find is a commercial product that costs
more than $100, and it crashes my Mac when closing a session...
Since it's best to do things by oneself, here's MacSSH.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. See the file COPYING for details.
This program is distributed in the hope that it will be useful, but without any warranty; without even the warranty of merchantability or fitness for any purpose. The entire risk of operation this program, as well as the risk of quality and performance, resides solely with you! In no event will any of the program authors be liable for any damage caused by the operation, or non-operation, of this program!
From Niels original docs:
lsh is written by Niels Möller, and distributed under the terms and conditions of the GNU General Public License (see the file COPYING for details). Several parts of lsh, in particular tcpforwarding, public-key user authentication, and the lsh_proxy program, were contributed by Balázs Scheidler.
Many other people have written free code which is used in lsh.
TWOFISH implementation by Ruud de Rooij. Released under the LGPL.
BLOWFISH implementation from Werner Koch's and FSF's GNU Privacy Guard. Released under the GPL.
CAST implementation by Steve Reid. Released into the public domain.
DES implementation by Dana L. How. Released under the LGPL.
IDEA implementation originally by Xeejia Lai, optimized by Colin Plumb. Released into the public domain.
GMP, the GNU multiple precision arithmetic library, was written by Torbjörn Granlund and many contributors. It is not actually included in lsh, but it is needed for all public key computations. GMP is released under the LPGL.
MD5 implementation by Colin Plumb, somewhat hacked by Andrew Kuchling. Released into the public domain.
RIJNDAEL implementation by Rafael Sevilla. Released under the LGPL.
SHA implementation by Peter Gutmann, somewhat hacked by Andrew Kuchling. Released into the public domain.
SERPENT implementation by Ross Anderson, Eli Biham, and Lars Knudsen,
somewhat hacked by Rafael Sevilla. Released under the GPL.
TCPUTILS networking code by Thomas Bellman. Released into the public domain.
POLL emulation code (for systems that have select(), but not poll()) written by Sean Reifschneider, released for unlimited use.
SEXP parsing code has some parts in common with Ron Rivest's parser. Distributed under the GPL with permission.
argp and getopt option parsing from the the GNU C library, released under the LGPL.