Mindshare Labs, Inc.

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.
<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.

Themepure

The Pure Metafields Plugin is a powerful tool designed to enhance the functionality and flexibility of your WordPress website. With this plugin, you can easily create and manage custom meta boxes, adding extra fields and data to your posts, pages, and custom post types.
<h3>Key Features</h3>
✅ Custom Meta Boxes: Create unlimited custom meta boxes with ease. Define the title, placement, and priority of each meta box to suit your needs.
✅ Flexible Field Types: The plugin offers a wide range of field types to choose from, including text, textarea, select, checkbox, radio buttons, date picker, and more. Customize the field options and validation rules effortlessly.
✅ Repeatable Fields: Enable the ability to repeat fields, allowing users to add multiple instances of the same field dynamically. Perfect for scenarios where you need to capture multiple sets of data.
✅ Conditional Logic: Set up conditional logic to show or hide fields based on the value of other fields. This feature adds versatility and improves the user experience of your forms.
✅ Built-in Validation: Ensure data accuracy by implementing validation rules for your fields. You can define required fields, validate input formats, and customize error messages effortlessly.
✅ Save and Retrieve Meta Data: The plugin provides simple functions to save and retrieve meta data, allowing you to access and utilize the stored information in your themes or plugins.
✅ Integration with WordPress API: Seamlessly integrate with the WordPress API and extend its functionalities. Hook into actions and filters to manipulate meta data and create dynamic interactions.
<a href="https://themepure.net/plugins/puremetafields/" rel="nofollow ugc">Live Docs</a>

Pure Metafields

Very light weight playable plugin

Pure Metafields is very light weight plugin tused to create custom metabox for any post type like page, post and your custom post type support it.

WP Ultimate Search vs Pure Metafields