Based on Simple Footnotes plugin for J! 1.5 by Witchakorn Kamolpornwijit http://joomlacode.org/gf/project/simplefootnotes/ to add footnotes/endnotes to your Joomla articles.

The extension is available for download as part of a paid subscription service. The subscription includes forum support and unlimited downloads of other premium site content for the duration of the subscription period.

Based on Phoca Open Graph plugin,  Ogplus for Joomla provides a convenient way to add Open Graph, Twitter Card and Google+ metadata to your Joomla articles.

The extension is available for download as part of a paid subscription service.  The subscription includes forum support and unlimited downloads of other premium site content for the duration of the subscription period.

See user documentation here.

Barcode UID is a module that displays the user ID of the currently logged-in user as a Code 128 barcode.

The extension is available for download as part of a paid subscription service.  The subscription includes forum support and unlimited downloads of other premium site content for the duration of the subscription period.

See user documentation here.

QR User is a module that displays the name of the currently logged-in user as a QR barcode.

Note:  this module relies on an extended jQuery library that may be incompatible with other Jooomla Javascript features on some web pages.  It is recommended that the module be placed on pages that are "light" in Javascript functionality.

The extension is available for download as part of a paid subscription service.  The subscription includes forum support and unlimited downloads of other premium site content for the duration of the subscription period.

A Joomla module to display a numerical score as a donut chart.  The concept and technique uses Javascript developed by HighCharts.com.  A demonstration of this module is available at http://demo.kuneze.com/donut-score.

The extension is available for download as part of a paid subscription service.  The subscription includes forum support and unlimited downloads of other premium site content for the duration of the subscription period.

See user documentation here.

Based on JExtBOX Article Status, this content plugin for Joomla displays tags highlighting new/updated, featured, most-viewed/popular and archived articles.  The plugin uses text-based tags instead of images in the original version.  With this plugin site owners can easily see which articles are popular or “hot” based on the article hit count(as demonstrated here on this site).

The extension is available for download as part of a paid subscription service.  The subscription includes forum support and unlimited downloads of other premium site content for the duration of the subscription period.

The plugin can be enabled for all categories, selected categories, blog/featured/category views as well as the single article view.

The plugin includes a CSS stylesheet that can be individually tailored to suit specific site requirements.

See user documentation here.