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Free Telnet/SSH Clients

OpenSSH for Windows
This is the OpenSSH port for Windows.

PuTTY: A Free Telnet/SSH Client
PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator

OpenSSH
OpenSSH is a free version of the SSH protocol suite of network connectivity tools that increasing numbers of people on the Internet are coming to rely on.

TTSSH: An SSH Extension to Teraterm
TTSSH is a useful tool designed to provide you with extra protection against the several traffic analysis vulnerabilities of the SSH protocol. TTSSH is brought to you as an extension for Teraterm Pro, the Windows terminal emulator and telnet client application.

Mssh
A very lightweight Python program that executes commands on multiple Linux hosts in a user-designated number of threads via SSH. Intended for management for a large number of Linux/Unix nodes