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The main features I miss in the forums I know (and are present in StackOverflow) are:

  1. An user profile page linking to the user topics (questions in SO) and replies (answers in SO).
  2. Another way to stay up-to-date with replies besides e-mail (SO has the Recent view)
  3. Comments to replies
  4. A clean, white background, borderless CSS

Do you know any open source forum system which would be closer to SO in the features described above? Or I'll have to implement this?