What is a simple easy software for implementing SSH on a Windows machine?

OpenSSH is a simple, free solution for Windows machines to implement SSH. OpenSSH can be downloaded at:
http://sshwindows.sourceforge.net/download/

OpenSSH, once set up uses NTFS permission security settings and can be used for domain and local accounts.

Once installed, OpenSSH comes with an easy guide to set up users, domain and local, and also to set the home directory.

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Another easy-to-use alternative is PuTTY

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I have been using the non-commercial download from ssh.com.
“SSH Secure Shell Client”.

Frequently I use the tunneling feature for X-windows when I am logged in to our linux cluster or other unix machines (you need a Windows X server)

http://www.ssh.com/support/downloads/secureshellwks/non-commercial.html