darrinb

Generates a template tag that allows you to easily display a snapshot of text. 
Useful for meta descriptions, post snippets, or your own custom block of text. 
Displays a snippet of text without having to use the <–!more–> quicktag.

WP Snapshot

Easily display a summary of post text or custom text.

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 Snapshot vs KM-ShowHide