PuTTY is an open source SSH and telnet client, developed originally by Simon Tatham for the Windows platform. Putty is a light-weight standalone application, that is easily to learn.
In addition, Putty also supports - Rlogin, Raw and Serial connections.
Putty is a well know tool among system and network administrators. However, Putty can be a handy tool for programmers, DBAs, and Software Testers as well, when working with Unix/Linux based systems.
Putty comes with many settings to customize your sessions to your project needs.