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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.
The latest version is beta 0.62.
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 Wales and in many other countries, but I am not a lawyer and so if in doubt you should seek legal advice before downloading it. You may find this 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.
2011-12-10 PuTTY 0.62 released
PuTTY 0.62 is out, containing only bug fixes from 0.61, in particular a security fix preventing passwords from being accidentally retained in memory.
2011-11-27 PuTTY 0.62 pre-release builds available
PuTTY 0.61 had a few noticeable bugs in it (but nothing security-related), so we are planning to make a 0.62 release containing just bug fixes. The Wishlist page lists the bugs that will be fixed by the 0.62 release. The Download page now contains pre-release snapshots of 0.62, which contain those bug fixes and should be otherwise stable. (The usual development snapshots, containing other development since 0.61, are also still available.)
2011-07-12 PuTTY 0.61 is released
PuTTY 0.61 is out, after over four years (sorry!), with new features, bug fixes, and compatibility updates for Windows 7 and various SSH server software.
2010-05-17 Google listing confusion
Several users have pointed out to us recently that the top Google hit for "putty" is now not the official PuTTY site but a mirror that used to be listed on our Mirrors page.
The official PuTTY web page is still where it has always been:
http://www.chiark.greenend.org.uk/~sgtatham/putty/