Ajax Search Pro is the best live search engine plugin for WordPress. Highly customizable, with many features and options, giving the best results possible!
AtoZ SEO Tools are search engine optimization tools. Over 50 SEO tools to track your SEO problems and help improve your website's visibility on search engines.
Vidopticon Video Search Engine Plugin for WordPress is a powerful tool to generate a custom video search engine on your web site, without your further intervention.
WooCommerce Product Search is a plugin that greatly enhances the default search engine from Wordpress and allows you to display instant search results for your WooCommerce online store.