vtiger CRM - Complete CRM solution

vtiger CRM is a complete CRM solution that includes Sales, Customer support, Service, Marketing modules, and ERP modules for Inventory & Projects. Its features include Lead management, Contact Management, Trouble Tickets, Knowledge Base, Campaign Management, Mass Mailing, Vendor Management, Invoices, Order management and lot more.

It supports Role based access control, Generates customizable reports, Support for mobile devices.

Sourceforge location: http://sourceforge.net/projects/vtigercrm/