Very popular free SSH client. Connects to hosts via secure shell, telnet or RS232. This program has been around for ages. It may not be the prettiest one, but it does the job...
Xshell is a terminal emulator that supports SSH, SFTP, TELNET, RLOGIN and SERIAL.
KiTTY is a fork from version 0.62 of PuTTY which has all the features from the original software, and adds many others.
MobaXterm is a very complete toolbox for remote computing, providing many useful advance functions directed to programmers, webmasters, and IT administrators.
The SuperPuTTY Window Manager for putty sessions https://www.facebook.com/superputty
Git bash is a command-line git client for windows.
A portable PuTTY/KiTTY interface for accessing remote systems via SSH.