Easily add QR encoded data to any post using a simple mark-up.

WP-QREncoder

Allows post authors to easily add qrencoded images to their posts. Uses: QRcode Perl CGI & PHP scripts ver. 0.50: http://www.swetake.

Richard Royal

Plugin allows users to generate QR Codes without reloading the current page. Visitors to your site can create custom Business Card, URL, and Text Message QR codes.
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<li><a href="http://www.sailabs.co/products/simple-qr-code-creator-widget/" rel="nofollow ugc">Project Homepage</a></li>
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Simple QR Code Creator Widget

A plugin that creates a QR Code (URL, Message, and Contact Information) generator for sidebar widget and in Posts and Pages.

WP-QREncoder vs Simple QR Code Creator Widget