vtiger CRM is an open source Customer Relationship Management (CRM)
software mainly for small and medium businesses.  vtiger CRM is
built over proven, fast, and reliable LAMP/WAMP (Linux/Windows,
Apache, MySQL, and PHP) technologies and open source projects, such
as SugarCRM (SPL 1.1.2), phpBB (GPL), and others.

WWW: http://www.vtiger.com