Sugar CRM
One of the most amazing aspects of the best customer relationship management software is that it remains open-source in nature. That means that anyone with the skills and knowledge can modify the core product to add functionality or alter the software in any way that might be deemed beneficial. Sugar CRM is one such piece of software, and there is an entire community built around the idea of customizing the software to optimally meet the needs of any specific business. Sugar CRM is already a powerful piece of software right out of the box, but no single piece of software is going to be perfect for every business. The fact that Sugar CRM allowed their software to remain open-source means they are so aware of the need for customization that they want all of their users to have the freedom to do what they wish with the software on their own.