Fabien Quatravaux

<a href="http://www.fontsquirrel.com/" rel="nofollow ugc">Font Squirrel</a> is your best resource for FREE, hand-picked, high-quality, commercial-use fonts. 
They provide a large part of their fonts in a web-embedding-ready way that is supported by all major browsers (@font-face CSS method).
The provided formats are : 
* TTF – Works in most browsers except IE and iPhone. 
* EOT – IE only. 
* WOFF – Compressed, emerging standard. 
* SVG – iPhone/iPad
They provide an API to list, preview and download fonts very easily : this unofficial plugin is using this official API.
When you browse fonts and dispplay one with this plugin, the font is downloaded from fontsquirrel.com. If you then choose to install the 
font, its css rule is put in the head section of you website pages so that you can use it on any page. The WordPress built-in editor 
(TinyMce) has a dropdown list that lets you choose the font you want for each part of your site.

Font Squirrel (unofficial)

Bring fonts from fontsquirrel.com into WordPress. Fonts kits are downloaded into your content directory and linked with @font-face.

kontur

This is a plugin directed primarily at type designers, lettering artists, foundries or resellers using WordPress to showcase their fonts without the need for coding knowledge.
The plugin allows you to embed interactive webfont specimens on your site via shortcodes. Users can preview, type with, and switch the webfonts in a preview, as well as use other interface options to manipulate the font sample.
After installing the plugin and creating a Fontsampler, you are able to showcase a set of webfonts by adding a simple [fontsampler id=123] shortcode to any page or post.
More information and clickable examples available <a href="http://fontsampler.johannesneumeier.com" rel="nofollow ugc">on the plugin website</a>.
Features include:
<ul>
<li>Interactive text field where users can type to preview the font</li>
<li>Controls for switching between fonts (if several are added to one Fontsampler)</li>
<li>Slider controls for manipulating font size, letter spacing & line height</li>
<li>Switches for alignment, inverting the text and background color, selecting language for testing locl features</li>
<li>Automatic detection and controls for testing Opentype features</li>
<li>Supports any language script and script direction</li>
<li>Supports woff files (woff2 support will hopefully be added soon, support for eot and ttf has been phased out)</li>
<li>Unlimited Fontsamplers per page</li>
<li>Customizable interface layout</li>
<li>Customizable interface styling</li>
<li>Customizable dropdown with preset texts</li>
</ul>

Fontsampler

This is a plugin directed primarily at type designers, lettering artists, foundries or resellers to showcase webfonts by embedding interactive type te …

Font Squirrel (unofficial) vs Fontsampler