SugarCRM - Open Source CRM Software, Customer Relationship Management

SugarCRM is a free CRM software that allows users to track opportunities and manage existing customers. It also enables to monitor other activities.

The three versions of SugarCRM are :

• Sugar Community Edition - free
• Sugar Professional - sold at an annual subscription.
• Sugar Enterprise - sold at an annual subscription.

GNU General Public License

SugarCRM is are based on the LAMP stack of Linux, Apache, MySQL and PHP. But it can also run on other platforms compatible with Apache, MySQL and PHP such as Windows, Solaris and Mac OS X.

http://www.sugarcrm.com/