title: Please suggest a tool to create a Domain Model diagram
body: <p>Could someone please suggest a tool to create a Domain Model diagram?
  Some details:</p>
  
  <ol>
  <li>I am running Windows at the moment</li>
  <li>A tool is free</li>
  <li>It's not a pencil and a sheet of paper</li>
  <li>It should be easy to use, i.e. I don't want to spend more than 5 minutes for a relatively simple diagram</li>
  <li>I hate MS Visio. IMHO, It's ill-designed.</li>
  </ol>