PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator.
Pre-Installation Notes: Windows or Linux operating systems are needed to download and install this software. Also, it is offered free of charge from PuTTY. The latest version of PuTTY is beta 0.63.
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PuTTY: Frequently Asked Questions
PuTTY: Documentation
PuTTY: Feedback
Resource: Chiark.greenend.org.uk