Super Search is a customizable widget which allows you to create search forms for custom post types.
Category Wise Search Widget plugin.You have option search specific category content.
The WP Search plugin replaces WordPress search with a better search that is fully customizable via the dashboard, API, filters and action hooks.
Official Pousadinhas.com.br plugin for WordPress. Places the Pousadinhas Search Widget on your site. Built and powered by Pousadinhas.
Extended search widget for bbPress 2.3+, plus Forum search Shortcode, plus widgetized not found content area for Form search 'no results'.
This Plugin adds a search widget for the Easy Digital Downloads plugin post type independent from the regular WordPress search.
A highly configurable and comprehensive Twitter search plugin that installs as a widget.
A full fledged search widget for wp e-commerce with grid view. NO GOLD CART REQUIRED.