SSH Communications Security (Popularity: )
http://www.ssh.fi/ Extensive information about the SSH protocol. Has a variety of SSH products for sale, including clients, servers, and VPN software.
dataComet (Popularity: )
http://www.databeast.com/ Scriptable SSH and telnet client supporting secure file transfer. Trial version available for download.
Van Dyke Technologies (Popularity: )
http://www.vandyke.com/ SecureCRT is an SSH client that supports X-session forwarding and secure file transfer. Evaluation version available for free.
OpenSSH (Popularity: )
http://www.openssh.org/ Freely available SSH1 and SSH2 implementation. Designed as part of the OpenBSD project, but portable to a number of unix-like ...
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