SSH Communications Security - Extensive information about the SSH protocol. Has a variety of SSH products for sale, including clients, servers, and VPN software.

Unix tools on Windows NT - Port of Unix SSH1 and SSH2 client and server to Windows NT.

SSH Patch Repository - NCSA's collection of patches for SSH.

IETF Secure Shell (secsh) Working Group - Contact information and papers of a group standardizing the SSH protocol.

SSH Master FTP Site - Binaries for SSH1 and SSH2 clients and servers for Windows and Unix.

F-Secure SSH - SSH clients and servers for multiple platforms. Free evaluation versions. Supports secure file copying and tunneling.

The FreSSH Project - A free SSH1 client and server for Unix

OpenSSH on Windows - Port of OpenSSH server and client for Windows.