openCRX is an open CRM solution that meets the needs of organizations requiring multifunctional, enterprise-wide coordination of sales generation, sales fulfillment, marketing and service activities to customers, partners, suppliers or intermediaries:
follow these links-
http://www.opencrx.org/
http://www.insidecrm.com/features/top-open-source-solutions-121307/
(Here you will get more open source CRM)