PuTTY

Very reliable and easy-to-use tool for the SSH protocol. Easy to download and start using--no installation required! Clean UI.

It's simple and does the job well. Very configurable. Key agent utility (pageent) works well.

the ease of use and its simplicity are definitely their highlights. The application is very basic when it comes to functionality, but it gets the job done, which is the most important feature to me. Other thing that it's good to mention is that ( probably ) lack of extra functionalities is what makes it so easy to use and get familiar with. If you are trying to get a wider set of functions it may be a good decision to go with something else, but I think most of the people will just use as a connectivity tool, so this works perfect for that