Mindshare Labs, Inc.

<p>A highly customizable AJAX-based WordPress search bar alternative with the ability to autocomplete <a href="http://en.wikipedia.org/wiki/Faceted_search" rel="nofollow ugc">faceted search queries</a>. Users can quickly and dynamically browse through your site’s taxonomies and post metadata to find exactly what they’re looking for, and results can be loaded beneath the search bar instantly.</p>
<h4>Features</h4>
<ul>
<li>Searches post title and body content</li>
<li>Can search by multiple keywords, and by full phrases</li>
<li>Highlights search terms in results</li>
<li>Option to send search queries as events to your Google Analytics account</li>
<li>Facets by post category</li>
<li>Can search in multiple categories (OR or AND search)</li>
<li>Category options are dynamically generated and autocompleted as you type</li>
<li>Attractive and lightweight interface based on jQuery, Backbone.js, and the VisualSearch.js library</li>
<li>Customizable results template using standard WordPress functions</li>
<li>Search through an unlimited number of user-specified taxonomies and meta fields (including data contained in Advanced Custom Fields).</li>
<li>Conduct radius searches against data stored in the ACF Map field (i.e. search for posts within x km of a user-specified location).</li>
</ul>


WP Ultimate Search

Powerful AJAX-based search alternative which supports faceting queries by taxonomies, terms, location, and post metadata.

Automattic

Daniel Bachhuber

<p>A quick and easy way to see post meta associated with any given post. When activated, this plugin prints your post meta keys and values inside of a post meta box.</p>
<p>Originally developed for <a href="http://vip.wordpress.com/" rel="nofollow ugc">WordPress.com VIP</a>-hosted clients, we thought it would be useful for development environments, etc. too. Feel free to <a href="https://github.com/Automattic/Post-Meta-Inspector" rel="nofollow ugc">fork the plugin in Github</a> and pull requests are always welcome. Hit us with feedback, questions, bug reports, and feature requests in the forums.</p>


Post Meta Inspector

Lovely little tool. Saves having to go into the database and look through the postmeta table when debugging. Thanks!

WP Ultimate Search vs Post Meta Inspector