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Knowners is a semantic visualization plugin, produced by FakePress and Art is Open Source. It is meant as a large-scale part of your wordpress interaface, where you can host a beautiful interactive graph that shows the semantic structure of your blog. Full HTML5 and Canvas support. Interaction.
Knowners is not a widget, but rather a wordpress extension that you can call in your theme templates.
This new version works directly on POSTS and the network visualization is built automatically using tags.
As with the other versions, follow these steps to install the plugin:
 unzip the archive in your wordpress plugin folder (you should obtain a ?knowners? directoty containing a bunch of files) go to your WordPress dashboard, to the section ?Plugins? identify the ?knowners? plugin in the list and click ?Activate? insert the PHP command knowners_render_posts() in your templates wherever you wish to display your POST-based visualization insert the PHP command knowners_render_links() in your templates wherever you wish to display your LINKS-based visualization you?re set! 
remember that the plugin is designed to occupy a large area: displaying it in a small div or other HTML container might not come out too nice.
The plugin automatically fills all the container it has been placed into.
The Knowners functions can be called anywhere in your theme and will take up all the space of the container in which they are called.
Please note that this plugin is designed to occupy lots of space: you will get awful results if you call it in smaller ones.
Please check out the plugin website for an example of its usage, so that you can get the feel of what you can achieve and please check back real soon for the updates, including the improved editing facilities and navigation tools.

knowners

Knowners is a semantic visualization plugin, produced by FakePress and Art is Open Source.

Nazmul Hossain Nihal

This allows user to add a widget that generates QrCode for every page dynamically. Whenever a visitor visits the site the widget will show qrcode for current page that the visitor is visiting. User can add the widget with and without title, define the size of the qrcode, fill color and background color. If the user finds that widget is not working because of any problem with theme user can add custom HTML tag before and after the widget. Multiple widgets can be added same time.
Using this you can add favicons to :
<ul>
<li>Add QrCodes</li>
<li>Customize QrCodes</li>
</ul>

WpQrCode

Just another WordPress plugin for adding QrCode.

knowners vs WpQrCode