DannyCooper

Enables a knowledge base post type and section taxonomy.
The plugin adds a Knowledge Base tab to your admin menu, which allows you to add articles just as you would regular posts. This allows you to keep your articles even if you change theme.
The Apollo Theme was built purposely to work with this plugin – <a href="http://crtv.mk/ez5P" title="Apollo WordPress Theme" rel="nofollow ugc">Apollo Theme</a>
<h4>Bugs</h4>
If you find an issue, let us know <a href="https://github.com/DannyCooper/knowledge-base-cpt/issues" rel="nofollow ugc">here</a>!
<h4>Contributions</h4>
Anyone is welcome to contribute to the Knowledge Base CPT plugin.
There are various ways you can contribute:
<ol>
<li>Raise an <a href="https://github.com/DannyCooper/knowledge-base-cpt/issues" rel="nofollow ugc">Issue</a> on GitHub</li>
<li>Send us a Pull Request with your bug fixes and/or new features</li>
<li>Translate the Knowledge Base CPT plugin into <a href="https://www.transifex.com/projects/p/knowledge-base-cpt/" rel="nofollow ugc">different languages</a></li>
<li>Provide feedback and suggestions on <a href="https://github.com/DannyCooper/knowledge-base-cpt/issues?direction=desc&labels=Enhancement&page=1&sort=created&state=open" rel="nofollow ugc">enhancements</a></li>
</ol>

Knowledge Base CPT

Enables a 'knowledge base post' type and 'section' taxonomy.

Galen Gidman

HelpPress is a powerful and easy-to-use WordPress knowledge base plugin. No complicated configuration, templating, or code updates. Just install and you immediately have a fully-functional self-help system for your customers.
<h4>Features</h4>
<ul>
<li>Theme Compatible: Compatible with almost any theme right out of the box. No templating required.</li>
<li>Responsive Design: Works on almost any device or screen size your customers may be using.</li>
<li>Live Search Results: Suggests relevant articles to your users live as they enter search terms.</li>
<li>Customizable URLs: Customize the URL slugs for all the major sections of your knowledge base.</li>
<li>Easy Content Organization: Organize knowledge base articles by category, tag, and post format.</li>
<li>Breadcrumb: Includes a built-in breadcrumb to help your users keep track of where they are.</li>
<li>Custom Templates: Override default templates with your own to better match your site.</li>
<li>Extendable: Includes dozens of actions and filters to allow for ultimate customization.</li>
<li>Lightweight: Coded with performance as a priority so it won’t slow down your site.</li>
</ul>

HelpPress Knowledge Base

A WordPress knowledge base plugin compatible with almost any theme.

Knowledge Base CPT vs HelpPress Knowledge Base