(PuTTY is a Telnet, SSH, rlogin, pure TCP and serial interface connection software. Earlier versions only supported Windows methods, and in recent versions, various Unix methods have been supported, and it is planned to be ported to MacOSX. In addition to the official version, there are many third-party groups or themselves porting PuTTY to other methods, such as Symbian-based mobile phones. PuTTY is an open source software, mainly protected by Simon Tatham, licensed under MITlicence. The latest version is now 0.63.)