putty: a free telnet/ssh client

PuTTY: A Free Telnet/SSH Client
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PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily bySimon Tatham.
The latest version is beta 0.58.
LEGAL WARNING: Use of PuTTY, PSCP, PSFTP and Plink is illegal in countries where encryption is outlawed. I believe it is legal to use PuTTY, PSCP, PSFTP and Plink in England and many other countries, but I am not a lawyer and so if in doubt you should seek legal advice before downloading it. You may findthis site useful (it‘s a survey of cryptography laws in many countries) but I can‘t vouch for its correctness.
Use of the Telnet-only binary (PuTTYtel) is unrestricted by any cryptography laws. Latest news
2005-06-09 Problems with 0.58 and Windows XP
We‘re getting occasional but persistent reports that the latest release, 0.58, fails to run on some versions of Windows XP (particularly pre-SP2), giving an "application configuration is incorrect" error message. The cause is known, and a variety of workarounds are described on the associatedbug page.
2005-02-20 SECURITY HOLE, fixed in PuTTY 0.57
PuTTY 0.57, released today, fixes twosecurityholes which can allow a malicious SFTP server to execute code of its choice on a PSCP or PSFTP client connecting to it. We recommend everybody upgrade to 0.57 as soon as possible.
2004-12-23 Trojan PuTTY installer circulating
We‘ve been alerted to a trojan PuTTY 0.56 installer that was posted on CNET‘s download.com for about a fortnight (now removed). We are informed it installed various spyware.
The file length was 509860 bytes (much shorter than any installer we‘ve ever released) and the md5sum was 49550e478e9dd008998c2c5294a884c5.
We‘d like to take this opportunity to encourage everyone to verify the signatures of PuTTY downloads before executing them. Details are on ourKeys page. Site map
Licence conditions under which you may use PuTTY.The FAQ.The documentation.Download PuTTY!
Subscribe to thePuTTY-announce mailing list to be notified of new releases.Feedback and bug reporting: contact address and guidelines. Please read the guidelines before sending us mail; we get a very large amount of mail and it will help us answer you more quickly.Changes in recent releases.Wish list and list of known bugs.Links to related software and specifications elsewhere. A page about the PuTTYteam members.