There is no reason to believe. It was registered by unrelated persons in 1999. Putty.org was not registered by a competitor to putty.
Chinese zodiac signs 1965 60 photos
Putty is an ssh and telnet client, developed originally by simon tatham for the windows platform. Putty is open source software that is available with source code and is developed and supported. It was purchased at a market price, by the current administrator, in 2008.
The domain putty.org contains public health warnings from a previously highly reputable individual who is in an exclusive position to make the claims he makes.
Do you believe that users searching for the putty project will find relevant information on your site, or do you knowingly accept that this could cause confusion?