GuMaxDD is a free Mediawiki skin with horizontal menu with dropdown tabs with these features:

  • iPhone compatible
  • Clean and professional
  • Tweak based on feedbacks from users
  • Customizable drop down menus, menus can be edited on the fly and easy to maintain
  • Drop down menu

Click image for larger version. 

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ID:	2845
Wiki Name: MediaWiki
Wiki Version: - 1.18
Installation_ Instruction
License: Unknown