title: Terminal emulator with good plugin support?
body: <p>Is there any good linux terminal emulator that supports plugins? </p>
  
  <p>What I am after:</p>
  
  <ul>
  <li>Open source</li>
  <li>Being able to highlight and color text fragments</li>
  <li>Being able to tweak the GUI (create popup windows, present menus and buttons integrated with the text display -- for instance to open the man page in a floating window when clicking on a command name)</li>
  <li>Being able to write plugins in a number of languages (Ruby preferred)</li>
  </ul>
  
  <p>Cheers!</p>