DannyCooper

This plugin removes font-family, font-size, font-weight, line-height and color declarations from existing content.
This can be useful if you have published posts and pages with out of date styling. It also removes unwanted styles that may appear when copy and pasting from Microsoft Word or other text editors.
Before:
<pre><code>Hello world.
</code></pre>
After:
<pre><code>Hello world.
</code></pre>

Font Stripper

Removes inline font declarations from existing content.

Jeff Sebring

Select up to 5 fonts from the <a href="http://www.google.com/webfonts" rel="nofollow ugc">Google Web Font Directory</a> to make available for use in stylesheets.
<h4>More Info</h4>
** This plugin does not automatically change your fonts, only enqueue’s the font import stylesheet. Edit your theme or child theme stylesheet to use your chosen fonts **
<a href="http://jeffsebring.com/wordpress/plugins/google-web-fonts" rel="nofollow ugc">Google Web Fonts for WordPress Plugin Home</a>
For more control over imported fonts, read <a href="http://jeffsebring.com/2012/how-to-use-web-fonts-with-wordpress/" rel="nofollow ugc">How to Use Web Fonts with WordPress</a>.

Google Web Fonts for WordPress

Select up to 5 fonts from the Google Web Font Directory to make available for use in stylesheets.

Font Stripper vs Google Web Fonts for WordPress