|WoWWiki does not attempt to be an AddOn UI Customization tool repository. There are so many AddOn and other software development sites that do a better job of that than a wiki can.
However, WoWWiki does act as the main source of documentation for a number of AddOn Development Tools whose authors have opted to do so. The AddOns that use WoWWiki for this purpose are called Hosted AddOn Tools. User reviews and recommendations are also in scope for wiki work, of course! See the WoWWiki AddOn page guidelines for more information.