Silpion

This plugin gives a possibility to manage Frequently Asked Questions as a custom post type. Site admin is able to add and edit questions and answers, assign them to categories and then display the output on any page using [faq] or [faq category={{category_id}}] on any WordPress page.
You can embeed the FAQ directly in your code using lcb_faq_display() function.

LCB FAQ

Displays questions with answers with FAQ category column.

Ben Huson

This plugin is designed to be a simple solid base for managing an FAQ section on your web site.
It consists of:
<ul>
<li>A simple ‘faqz’ post type</li>
<li>[faqz /] shortcode</li>
<li>FAQ search widget</li>
<li>FAQ search form template tag</li>
</ul>

FAQz

Simple management of Frequently Asked Questions (FAQ).

LCB FAQ vs FAQz