If you live at the command-line, or are logged into 10 different remote machines at once, you should definitely try out Terminator. Originally inspired by projects like quadkonsole and gnome-multi-term and more recently by projects like Iterm2, and Tilix, It lets you combine and recombine terminals to suit the style you like. Since then, it has become The Robot Future of Terminals.
Terminator was originally developed by Chris Jones in 2007 as a simple, 300-ish line python script.
