10 Best CRM is now ready to present the top open source CRM software. Open source solutions are the preferred choice of many businesses from all over the world, especially smaller businesses that cannot afford to make significant investments on software purchases. They are also easier to customize and integrate with other business software and online services. With these leading open source CRM software programs, users will get access to various advanced features, such as integration with VoIP systems, sales tracking and reporting, as well as accounting features, all without the high costs of proprietary software. Ranking order is based on a wide range of qualitative and quantitative statistics, including the payment of variable monthly listing fees to be in our directory. Learn more about our ranking process here.