Category Dropdown in the Search Form
Adds a category dropdown to the site search form and the Search block, so visitors can search all content or only one category.
Snippet Library
Search snippets for WordPress
Snippets that improve WordPress search: search custom fields and post types, exclude pages, redirect single results and highlight matching words. For content-heavy sites where visitors need to find things quickly.
Search Within the Current Category
On category pages, adds an "Only in [category]" checkbox to the search form and Search block, ticked by default, so visitors can search just that section.