oishikazuo

Self Shortener is a WordPress plugin to be able to handle URL shortening 
feature, by your WordPress site itself.
Self Shortener can:
<ul>
<li>create short URL using your site URL.</li>
<li>generate random short URL key, by specifying key length.</li>
<li>specify fix URL key instead of random generating.</li>
<li>handle I18N message. Currenly supports English and Japanese.</li>
</ul>
See http://giraffy.jp/products_en/wordpress/selfshortener/ . 
(In Japanese, http://giraffy.jp/products/wordpress/selfshortener/ )

Self Shortener

URL Shortener handled by your WordPress site itself.

Arka Roy

This plugin enables you to automatically generate QR Codes for your pages, posts and custom post types. The generated QR Code will have embeded url of the post, page.
The plugin provides following features:
<ul>
<li>Easy installation and integration.</li>
<li>Easy-to-use user interface.</li>
<li>Generate QR Codes automatically with the url of the current page or post.</li>
<li>Option to embed the permalink or the shortlink of the page/post.</li>
<li>Use shortcode <code>[wpqr-code]</code> to generate QR Code with current url or use <code>[wpqr-code id=10]</code> with the id of the page/post to generate url for.</li>
</ul>
<h4>Update in 1.1.0</h4>
<ul>
<li>Added feature to generate QR code for any (custom) URL.</li>
</ul>

WP QR Code Auto Generator

Automatically generate QR Code for pages, posts and custom post types with permalink or shortlink. You can embed QR Code with shortcode.

Self Shortener vs WP QR Code Auto Generator