PuTTY - Popular free terminal application. Mostly used as an SSH client.
jEnTunnel - Manage SSH Tunnels made easy
Shell NGN - SSH From your browser
MyEnTunnel - Basically, MyEnTunnel is an efficient method for maintaining the tunnels of TCP SSH, MyEnTunnel has many advantages upon its usage. Plink (PuTTY Link)...
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Core Tunnel - Core Tunnel is the best way to manage your SSH tunnels, with OS X Keychain integration.