PuTTY

Putty is very easy to use. When you work data warehousing or enterprise datalakes its very handy to save different servers and run unix/linux commands to transfer file, run jobs, secure copy.

It allows me to save my SSH configurations all in one place, and access my machines from a lightweight GUI. I can add new connections quickly, as you can take an old configuration and use it as a draft for your new machine.

I like best about Putty are its simple and friendly user interface that can be used and navigated easily, rich of features like can access devices with any ports to be processed easily in configuration, implementation and migration and its already saved the cost because of open source.