Choosing the best CRM software for your organization depends upon your business needs. A system that may suit a particular organization’s needs, might not conform well to your business. A good CRM helps to revamp your sales operations, so you need to address your needs and expectations first and then choose accordingly, the best-suited CRM system for your business. If you ever felt a need to try a CRM, go for the ones in the list above. These are according to me, the best open source CRMs and the good thing about them is that they all are free.