Tmux is one of things I don’t think I can do without.
It allows you to run programs, have windows or tabs as well as several panes running different applications simultaneously.
Further more, it is trivial to be able to reattach to a tmux session and resume working on exactly the same window and pane layout.
For instance, I connect to a linux host on my local network from my Windows box. From there I ssh into several servers and maintain active connections.
Now say I need to restart my Windows box, I do not need to worry about losing my place with the tmux session or any of the windows / tabs and panes.
All I need to do after the restart is connect to the linux host and reattach / resume my sessions.
If you do any work with Linux systems, I highly recommend this productivity tool.