yannishimself

QR Code Generator creates scannable QR codes for your WordPress content. Each post, page, or WooCommerce product gets a compact short URL (<code>/go/{base36}</code>) that 301-redirects to the original permalink.
Key Features:
<ul>
<li>Pure PHP QR code engine — no external APIs, no JavaScript rendering</li>
<li>Short URLs via <code>/go/{base36}</code> with permanent 301 redirects</li>
<li>Works with posts, pages, and WooCommerce products</li>
<li>Customizable pixel size, quiet zone, and colours</li>
<li>One-click generate, download, and copy from the editor sidebar</li>
<li>Lightweight — only requires the PHP GD extension</li>
<li>ISO/IEC 18004 compliant QR encoding</li>
</ul>
How It Works:
<ol>
<li>Edit any post, page, or product</li>
<li>Find the “QR Code” meta box in the sidebar</li>
<li>Click “Generate QR Code”</li>
<li>Download the PNG or copy the short URL</li>
</ol>

FARM QR Code Generator

Generate scannable QR codes with short, branded redirects for any post, page, or WooCommerce product. Pure PHP, no APIs.

wokamoto

This is a plugin creating a new tweet including a URL of new post on your wordpress.
You can use specific tweet phrases by post authors. 
And You can also tweet short URL of your domain if you introduce the plugin <a href="https://wordpress.org/extend/plugins/short-link-maker/" title="Short link maker" rel="ugc">Short link maker</a>.
PHP5 Required.
<h4>Localization</h4>
<ul>
<li>English (en) – <a href="http://www.odysseygate.com/" title="Odysseygate.com" rel="nofollow ugc">odyssey</a></li>
<li>Japanese (ja) – <a href="http://dogmap.jp/" title="wokamoto" rel="nofollow ugc">wokamoto</a> (plugin author)</li>
<li>Belorussian (be_BY) – <a href="http://pc.de/" title="PC.DE" rel="nofollow ugc">Patricia</a></li>
<li>Dutch (nl_NL) – <a href="http://wpwebshop.com/blog" title="WPWebshop Blog" rel="nofollow ugc">Rene</a></li>
<li>German (de_DE) – <a href="http://www.creditriskmanager.com/" title="Credit Risk Manager" rel="nofollow ugc">Rian Klijn</a></li>
</ul>
If you have translated into your language, please let me know.
<h3>Licence</h3>
Released under the <a href="http://www.gnu.org/copyleft/gpl.html" rel="nofollow ugc">GPL license</a>.

Simple Tweet

This is a plugin creating a new tweet including a URL of new post on your wordpress.

FARM QR Code Generator vs Simple Tweet