CategorySuggest

CategorySuggest is an extension that greatly simplifies putting categories in MediaWiki.

Ordinarily, you'd have to put categories in Mediawiki by typing out the Category markup for every single category, which is tedious and boring.

With this extension, just type the Category in the box it adds to the edit window, and it will add the category to the page for you. It even shows you the most likely category you're looking for while you type, making this ideal for MediaWiki beginners new to category insertion, or those who just don't want to have to type out each category and its markup by hand.