Vtiger Account plugin is an plugin which synchronizes the joomla user account data with the Vtiger CRM data. This only happens when the user logs in at the joomla site. You get an Account in Vtiger when it is an new user, and it updates the account when the user comes back or changes his data. So you get a perfect solution to get users data from your joomla site into VtigerCRM. To download it you have to Register.
At this moment we are in an 90% stage of connection to Virtuemart "Virtuemart Vtiger Component". We developed an plugin which can see if a joomla user put in his adres, and VM needs. Also it is possible to sync Virtuemart Data like Recieve and Invoice address, products and invoices. To use this connector and the next you heave to download and install VTigerSQL program. It is simpel to install and use, but it takes some efford to get it working. Put it on the same server as your VTIGER is on, make an new directory, and copy the script into it. After that put in config.inc.php the directory to your Vtiger installation.