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.

Chris Dillon

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This plugin is up for adoption.
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Un-Line-Break is a lightweight plugin with a very specific purpose: Improved shortcode readability.
Normally, in the post editor, placing shortcodes on separate lines (like HTML formatting) results in extra line breaks in the rendered output, thanks to the WordPress auto-paragraph function (wpautop).
This plugin removes those extra line breaks from the rendered output so, in the post editor, you can place shortcodes on separate lines, thus making it easier to read and edit them.
It will not remove any double-spacing or <code></code> or <code> </code> tags that you have added.

Un-Line-Break

Remove unwanted line breaks from shortcode content.

Empty P Tag vs Un-Line-Break