byobu (http://byobu.co/) is an amazing thing to have on your remote server, sessions and switchable windows + splits make this a must-have tool. Think of it as tabs but for your SSH session, plus many more features.
Just a quick note on this - byobu isn't a tmux alternative exactly. It actually uses tmux (or screen) on the back-end. So it's more like a nicely configured tmux.conf/.screenrc with standardized bindings.
