PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham. PuTTY is released under version 2 of the GNU Public License.

Features of PuTTY

• It is a very useful tool for performing remote administration of Unix servers. It has the following features:
• Supports SSH connections.
• It is cross-platform, and can be used in Windows, Linux and Mac OS.
• Used for performing remote administration of Unix servers.
• Supports other network protocols like Telnet, Rlogin, rsh etc.
• It is very easy to use.
• Can be used for logging into Unix systems remotely.
• Provides the option of logging in with a public key.
• It has a very good documentation.
• Ssupports many encryption mechanisms like SSH-1, SSH-2, Blowfish, 3DES, AES, DSA, RSA, and RSA-M.

In addition to the core protocol implementations, PuTTY includes a terminal emulator, various pieces of terminal-handling code (including VT100 and xterm), a few pieces of ancillary software (such as PSCP and Plink), and a few other odds and ends.