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The 123 Web Messenger Joomla Module can empower your site with a Facebook Messenger style web chat bar at the bottom of browser.
Apply URL: http://www.123flashchat.com/free-web-messenger.html

It allows users to chat with each other from 123 Web Messenger’s interface in the web page: click the icon to popup the friend list of 123 Web Messenger to chat with buddies on website conveniently.

The Facebook Messenger style web messenger is hosted by 123 Web Messenger free of charge, no limitation to the number of concurrent user, and provide 1 to 1 chat function. And there is a chance to join Affiliate Plan and earn money while use the 123 Web Messenger.

http://www.123flashchat.com/download/joomla_mod_for_123webmessenger.zip

This extension for ARTIO JoomSEF enables generation of Search Engine Friendly (SEF) URLs for GroupJive component. It is compatible with JoomSEF 3.x.

http://www.joomace.net/e-shop/artio-joomsef-extensions/groupjive-joomsef

VMT Google Analytics Module makes a more easy way to integrate Google Analytics into Virtuemart so that you can specify a goal and track the number of converted sales.
If you just want Google Analytics to measure your traffic in Virtuemart site. Place the code in your main Joomla template and this will work very well.
If however you want to set a goal to track sales conversions, then you need to provide Google Analytics with a unique URL for the thank-you page in Virtuemart website. Virtuemart will simply returning index.php as the thank you page, this module works around to get that unique URL.

http://virtuemarttutorial.com/index.php?page=shop.product_details&flypage=flypage_vag.tpl&product_id=15&category_id=6&option=com_virtuemart&Itemid=2