As always, it depends on what you are needing. Do you only need console? Then SSH and tmux work great. Do you need to take control over the other person's des

As always, it depends on what you are needing. Do you only need console? Then SSH and tmux work great. Do you need to take control over the other person's desktop? Transfer files? In this case, there are lots of options. VNC, GoToAssist, TeamViewer, LogMeIn... etc.