Bitvise SSH Client A fast and feature-rich SSH client with support for telnet, FTP, FTPS, secure connections, file transfers and TCP/IP tunneling.
PuTTY Highly flexible SSH client with Xterm terminal emulation and support for Rlogin, SFTP, Telnet and Serial connections.
MobaXterm Linux-based X11 server that runs on Windows with many UNIX tools and GUI.