title: Good diff tools under Ubuntu GNOME
body: <p>Could somebody give me some recommendations on diff tools on Ubuntu? Actually what I need is not just file comparison, but also directory comparison.</p>
  
  <p>I think diff tools under Windows is really most convenient, especially WinMerge. </p>
  
  <p>But under Ubuntu, what I can get with high efficiency is only TkDiff, but it only support file comparison?</p>
  
  <p>Hope to get some help from here. </p>