PuTTY is a client program for the SSH, Telnet and Rlogin network protocols.

These protocols are all used to run a remote session on a computer, over a
network. PuTTY implements the client end of that session: the end at which
the session is displayed, rather than the end at which it runs.

Homepage:
https://www.chiark.greenend.org.uk/~sgtatham/putty/
