Jesse Naylor

Text Orphans Remover (a.k.a. #NoMoreOrphans™) improves the visual quality of long-form, responsive text by preventing “orphan” words on the last line.
This plugin adds a lightweight script on the front-end only (never in wp-admin). It measures each text block and, when appropriate, replaces the last breaking space with a non‑breaking space.
Default processed elements: 
 p, li, h1–h6, blockquote, figcaption, dd, dt
You can override the selector via JavaScript: 
 window.TextOrphansRemoverSelector = ‘p, li, .my-class’;

Text Orphans Remover

Prevents typographic “orphans” by replacing the final breaking space with a non‑breaking space in common text blocks (front‑end only).

Morgan Estes

Building on <a href="http://www.shauninman.com/archive/2008/08/25/widont_2_1_1" rel="nofollow ugc">Shaun Inman’s plugin</a>, Widon’t Part Deux eliminates <a href="http://en.wikipedia.org/wiki/Widow_(typesetting)" rel="nofollow ugc">widows</a> in the titles and content your posts and pages.
<h3>Known Issues</h3>
<ul>
<li>It doesn’t always work if the last word of in the element is wrapped in a tag. (Like if the final word is <code>bold.</code>)</li>
<li>You can’t pick how many words are on the last line (yet).</li>
</ul>

Widon't Part Deux

Widon't Part Deux eliminates typographic widows in the titles and content your posts and pages.

Text Orphans Remover vs Widon't Part Deux