Richard Bush

The Haley Marketing How-To Tips plugin creates a Custom Post Type for managing a knowledge base section of your site. It adds a custom taxonomy and two widgets to display the custom taxonomy list and a Recent Tips sidebar.
The post type and taxonomy labels can be customized from the admin panel.

HMG How-To Tips

The Haley Marketing How-To Tips plugin creates a Custom Post Type for managing a knowledge…

TC.K

Ultimate WP Query Search Filter is a powerful search engine that lets your users perform more precise searches by filtering the search through post types, taxonomies and meta fields. The search result can be displayed either through the theme search template or an Ajax call.
Plugin Features:
<ul>
<li>Admins are free to choose whether the search filters post type, taxonomy, meta field or even all three.</li>
<li>Multiple search forms supported.</li>
<li>Free to choose either theme search template or Ajax call to display the result for each of the search forms.</li>
<li>Search forms support checkbox, radio and select fields.</li>
<li>Plugin extendable with hooks.</li>
<li>The search form can be displayed via shortcode.</li>
</ul>
If you have any problems with the current plugin, please leave a message via support forum post or go <a href="http://9-sec.com/support-forum/" rel="nofollow ugc">Here</a> to visit the 9-SEC forum.

Ultimate WP Query Search Filter

Just what i was looking for

Surprisingly the plugin still does what it says.

to tget arround an install error i had to change in ultimate-wpqsf.php Line 126 

= '';
to
= [];

tons of filters let me adapt the bit outdated html markup

Pretty good if you know what you do

Ultimate WP Query Search Filter lets you filter searches through post types, taxonomies and meta fields. Results displayed via search template or Ajax …

HMG How-To Tips vs Ultimate WP Query Search Filter