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).

Luis Rock

Based on jQuery Paper Collapse Plugin, by Alexander Rühle, this WordPress plugin allows you to create toggles in format of collapsible paper cards, inspired by Google Material Design.
You can even use FA icons on your toggles.
Install and basic usage video: 
https://www.youtube.com/watch?v=6h_TpRY_JCc
Titles, icons and content: 
https://www.youtube.com/watch?v=aAk9ER-Wc28
Shortcode attributes: title, icon, color

Master Paper Collapse Toggle

Allows you to create toggles in format of collapsible paper cards, inspired by Google Material Design.

Truncate Comments vs Master Paper Collapse Toggle