F-Secure SSH - SSH clients and servers for multiple platforms. Free evaluation versions. Supports secure file copying and tunneling. www.f-secure.com/products/ssh
IETF Secure Shell (secsh) Working Group - Contact information and papers of a group standardizing the SSH protocol. www.ietf.org/html.charters/secsh-charter.html
OpenSSH on Windows - Port of OpenSSH server and client for Windows. www.networksimplicity.com/openssh
SSH Communications Security - Extensive information about the SSH protocol. Has a variety of SSH products for sale, including clients, servers, and VPN software. www.ssh.fi
SSH Master FTP Site - Binaries for SSH1 and SSH2 clients and servers for Windows and Unix. ftp://ftp.ssh.com/pub/ssh
SSH Patch Repository - NCSA's collection of patches for SSH. www.ncsa.uiuc.edu/General/CC/ssh/patch_repository
The FreSSH Project - A free SSH1 client and server for Unix www.fressh.org
Unix tools on Windows NT - Port of Unix SSH1 and SSH2 client and server to Windows NT. www.lexa.ru:8100/sos
OpenSSH - An open source SSH client and server. www.openssh.com