You find here two of the most common ssh tools described. But many more are available.
The Unix SSH client is preinstalled on numerous OSes and distributions (including MaxOS-X). Otherwise you can quickly install it using a packet manager. Standard command for a connection is:
ssh [username]@[ssh server]
while [username] and [ssh server] must be replaced.
Putty is an open-source windows tool. It operates portable so it does not need an installation. It can be downloaded here.
To use it simply type the ssh server name in the “Host Name” field and click “open.”