Peter Westwood

This plugin allows you to specify a specifc excerpt for WordPress pages.
The plugin adds an extra box to the set an Optional Excerpt for a WordPress page similar to the box which is available for posts. The box is aded using the dbx_page_advanced hook for versions of WordPress earlier than 2.5 and using add_meta_box() for WordPress 2.5 and later.

PJW Page Excerpt

This plugin allows you to specify a specifc excerpt for WordPress pages.

Husain Ahmed

This plugin remove extra p and br tags from the_content, the_excerpt and widget_text_content.

Empty P Tag

This plugin is very easy to install and use, there are no extra setting to do.

Easy and best performance

This plugin hides empty paragraphs and make your butyfull design without breaking design.

PJW Page Excerpt vs Empty P Tag