Windows

AbsoluteTelnet
Supports Telnet, SSH v1, SSH v2, SFTP, and serial connections and includes ssh port forwarding, X forwarding, and additional authentication options. Shareware. [Win 95/98/Me/NT/2000/XP/Vista]
http://www.celestialsoftware.net/ssh/

AnzioWin
Full-featured telnet client, supporting multiple terminal types, passthrough printing, foreign language support, scripting and SSH. Price information, specifications, ordering and download.
http://www.anzio.com/products/anziowin.htm

Bitvise Tunnelier
Implements SSH2 port forwarding.
http://www.bitvise.com/tunnelier.html

InterSoft International, Inc.
SecureNetTerm provides emulation of a variety of terminals and supports secure file transfer. Commercial and evaluation versions available in multiple languages.
http://www.securenetterm.com/

PockeTTY
VT100 terminal emulator. Supports SSH1, SSH2, telnet, and serial connections. Shareware. [WinCE].
http://www.dejavusoftware.com/pocketty/index.html

Private Shell
SSH client with built-in GUI SFTP client. Supports SSH1, SSH2, telnet, serial connection. Configuration wizard. Both graphical and command-line interfaces. Shareware. [Win32].
http://www.privateshell.com/

PuTTY
Open source SSH client with remote file copying support. [Win32 (Intel and Alpha)]
http://www.chiark.greenend.org.uk/~sgtatham/putty/

SecEx
Graphical SCP/SFTP client. Limited version available for download. Online ordering. [Windows]
http://www.bytefusion.com/products/ens/secex/whatissecureshell.htm

SecureToken
SSH client also supports telnet, rlogin, and direct COM port accessing. Trial version available for free.
http://choung.net/SecureToken/

ShellGuard
Command line telnet and SSH client. Trial version available for download.
http://www.shellguard.com/

Silicon Circus
PenguiNet is a shareware telnet and SSH client that supports port forwarding. [Win 9x/NT]
http://www.siliconcircus.com/

SSH for Windows
Piotr Kucharski's free Windows SSH client
http://42.pl/ssh/index_en.html

Van Dyke Technologies
SecureCRT is an SSH client that supports X-session forwarding and secure file transfer. Evaluation version available for free.
http://www.vandyke.com/

Windows NT Utilities
A command-line SSH client. Supports secure file copying.
http://bmrc.berkeley.edu/people/chaffee/winntutil.html

WinSCP
Open source graphical SFTP client for Windows. Legacy SCP protocol is also supported.
http://winscp.net/

wodSSH Component
Client COM module supporting telnet and SSH access.
http://www.weonlydo.com/index.asp?showform=SSH