Arefly

Sometimes when user are using the search function of your blog. They may not know the full string of they want to search.
And this plugin will add a Search Keyword Hint (get hints from all tags) on the search form of your site.
So that user can find the things they want to search more easily.
Live Demo: <a href="http://www.arefly.com/" rel="nofollow ugc">Click Here</a> (Try enter any word in the search box.)
中文介紹請看<a href="http://www.arefly.com/wp-search-auto-match/" rel="nofollow ugc">這裏</a>

WP Search Auto Match

Add Search Keywork Hint like Google Search to your blog's search form.

philippe

Adds a widget that display a simple calculator.

Calculator

Adds a widget that display a simple calculator.

WP Search Auto Match vs Calculator