Akramul Hasan

This is a very straightforward tiny but useful plugin to add a block element that will help to create the Frequently Asked Questions (FAQ) section. It is very easy to use. After installing this plugin, a custom block item will be available, which will have a repeater pair of fields to add a question and answer. In the front end, it will generate a nice and smooth collapsible FAQ section.
<ul>
<li>No Extra library or script</li>
<li>Very lightweight and easy to use</li>
</ul>

WPFY FAQ Block

Gutenberg Block plugin for Frequently Asked Questions (FAQ) feature. Very straight forward to use. Just install and enjoy.

Josh Levinson

UPDATE As of 3.0.0, this plugin has the following requirements:
<ul>
<li>PHP 5.3+</li>
<li>WooCommerce 2.0.0+</li>
</ul>
If you have ever used eBay’s ‘Ask Buyer’ system before, you will know how this plugin behaves. 
WooCommerce Product FAQs allows visitors to ask questions about specific products, get answers, and view other threads. 
It also allows you, the store owner, to manually add questions to specific products.
<a href="http://joshlevinson.me/shop/flying-ninja/#tab-faqs" rel="nofollow ugc">Click here</a> for a sample WooCommerce product page with some FAQs.
<h4>FAQ Notifications</h4>
Notifications are in place that will notify the admin of new questions, with links to administer each question.
Notifications are in place that will notify the asker when their question has been answered, with links to view the product.
Each notification email has a system to highlight the question specified in the email, 
so in the case of numerous questions, the user does not have to hunt for his question.
<h4>To Do:</h4>
<ul>
<li>
Add ajax loaders where ajax is used so the user knows that their request is being processed DONE
</li>
<li>
Consider adding inline registration option to FAQ form
</li>
</ul>
<h4>Incompatibilities</h4>
<ul>
<li>
Disqus – interferes with the <code>comment_form</code> function. Will hopefully rectify this soon.
</li>
<li>
404 Redirected – strips $_GET parameters from URL, removing ‘View’ and ‘Preview’ functionality
</li>
</ul>
<h3>Developers</h3>
= Available filters: =
Format: (filter ; filtered variable ; available variables: var1 (explanation [var type]), var2, var3, …)
All filters are prefixed/begin with <code>woocommerce_faqs_</code>
<ul>
<li>
admin_faq_highlight_color ; Highlight color in the Dashboard when administering a question from the email link
</li>
<li>
front_faq_highlight_color ; Highlight color on the front-end when viewing a question from the email link
</li>
<li>
antispam_error_message ; Error message when the anti-spam check fails ; $result[‘message’] (error message [string]), posted form (full $_POST[array])
</li>
<li>
answerer_email ; Email for administering FAQs; $post_data (‘question_title’, ‘faq_author_name’, ‘product_title’, ‘question_content’ [array])
</li>
<li>
asker_email ; Email for the asker; $post_data (‘question_title’, ‘product_title’, ‘post_id’ [array])
</li>
<li>
answerer_email_subject ; Subject of administer email; same as answerer_email vars
</li>
<li>
answerer_email_message ; Final adminster message; same as answerer email vars
</li>
<li>
asker_email_subject; Subject of asker email; same as asker_email vars
</li>
<li>
asker_email_message; Final asker message; same as asker_email vars
</li>
<li>
answer_caps; Capability of answering questions
</li>
</ul>

WooCommerce Product FAQs

Extends WooCommerce to allow for the asking, answering, and viewing of FAQs in a similar experience as on marketplaces like eBay and Amazon.

WPFY FAQ Block vs WooCommerce Product FAQs