What software is best for accessing a remote ssh server?

On MACOS, PLAN 9, 9-FRONT, UNIX and LINUX operating systems, in a terminal window, or at the bash shell prompt, use the ssh command, as follows:

• ssh user-id@server-domain-or-IP-Address<carriage-return-key>

On ANDROID, download an app that runs SSH.  Be careful to choose one that doesn't run advertisements or which limits you on "features" or charges extra for "features".  Once, you have that SSH app installed, then provide it with the server-domain-or IP-Address to connect your device to.  When you connect to that system, it will either ask you for the user-id to use when connecting, or in the setup of the server information ask you for the user-id to use.  In the latter case, such entry might be optional, and leave entry of user-id and password upon connection to the server.

On ANDROID, you may also install Andronix and/or Termux.  After installation, startup Termux and try invoking the ssh command at the prompt (e.g. - $) Follow the directions to install its version of the openssh package.  After that, it should work.

On WINDOWS, you have several options that are inconvenient to install for the novice user:

• Download the Putty App and install it.
  
  https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
• or Download MS-Kermit and install it on MS-DOS or Windows 3.11.  (It will not run on modern Windows, even in compatibility mode.  It is a pre-Windows 95 application)
  
  http://www.columbia.edu/kermit/mskermit.html
• or Download Kermit-95, version 10 and install it. (NOTE:  This version of Kermit doesn't emulate a Tektronix 4014 Graphics Terminal!)  If you require TEKTRONIX emulation, install MS-KERMIT if you don't want to or care to install and boot (startup) a Live-Linux Operating System.
  
  https://kermitproject.org/ckw10beta.html
• or install VMWare Workstation, and make a virtual machine, and boot the virtual machine using a live-linux or Plan 9 boot medium, following the instructions of the distribution.  There are Youtube videos that attempt to explain this procedure.
  
  https://www.vmware.com/products/workstation-pro.html
• or download and install VirtualBox:
  
  https://www.virtualbox.org and then provision a virtual machine to boot from a LIVE LINUX CD or DVD image.
• or get a computer expert to help you with the installation of VMWare Workstation and help you provision a virtual machine.
• The best procedure for getting Tektronix 4014 emulation that is fantastically good is to install MS-Kermit.  That program runs only on DOSEMU, or MS-DOS on a virtual machine, or Windows 3.11 on a virtual machine.  On a Linux Distribution LIVE-CD or LIVE-DVD, DOSEMU is most often installed and ready to run.
• Tektronix 4010 series (including 4014) Graphics Terminal emulation is available by running the xterm command at the bash shell prompt or in a Linux Terminal Window.
• A nice modern Tektronix emulation is also available for Linux Distributions, such as Debian or Ubuntu at:
  
  https://github.com/rricharz/Tek4010.  MS-Kermit, however, emulates the TEKTRONIX 4014 most capably using DOSEMU or a Virtual Machine running either MS-DOS or Windows 3.11.