Rene Maurer

This plugin hides the text that is defined between the simple Shortcode. By clicking on the user-defined link, the hidden text becomes visible. It works via a Shortcode and can be placed everywhere!

Usage: [show_more more=”TEXT” less=”TEXT”] Content [/show_more]
You can use some parameters like: 
– more=”show more” 
– less=”show more” 
– color=”#0066CC” 
– list=”»” 
– align=”left” | “center” | “right” 
– size=”120″

WP show more

I have tried other plugins 'read more' plugins but ended up with frustrations.. Only this one works - simple and fast. If you are looking for read more plugins, don't bother with others, just install this one. 

Don't bother with other plugins! Just install this one!

Hide the Text between a simple Shortcode.

man_ketan

This plugin allows you show/hide text in post and page by inserting simple shortcode. 
Example usage: [km_showhide]Hidden content goes in here.[/km_showhide]

KM-ShowHide

This simple plugin allows you to toggle your content inside shortcode.

WP show more vs KM-ShowHide