Flector

Truncate Comments is a plugin that hides a part of a long comment under a “Read more” link that, when clicked, reveals the hidden part of the comment. The plugin provides the functionality of Amazon.com comments.
If you liked my plugin, please rate it.
The plugin uses <a href="http://www.aakashweb.com/jquery-plugins/collapser/" rel="nofollow ugc">jQuery Collapser</a> by Aakash Chakravarthy.

Truncate Comments

The plugin uses Javascript to hide long comments (Amazon-style comments).

marcrandall

Turn your standard woocommerce product categories widget into a smooth collapsible accordion. 
This plugin should work out the box with most themes.
<ul>
<li>Supports unlimited subcategories</li>
<li>Current category will be expanded on page load</li>
<li>Lightweight and requires little configuration</li>
<li>You can customise the look in your themes CSS editor</li>
</ul>

Woocommerce Sidebar Category Accordion

the plugin is light, compatible with two themes (I've tested) and it does what it says.

works like a charm

Turn your standard woocommerce product categories widget into a smooth collapsible accordion.

Truncate Comments vs Woocommerce Sidebar Category Accordion