OroCRM
If you're in search of the most flexible open source CRM software, OroCRM can deliver. It was built to be expandable and flexible, so that each organization deploying it can truly customize it to fit their unique business needs. It has a community of developers behind it that is highly active on the project and regularly brings new and innovative ways to transform the platform. With OroCRM, you get all of the features that you can expect from the best CRM software. This includes giving you a 360 degree view of each client, no matter how they interact with you, such as in store, on your e-commerce site, through social media, email or phone, as well as online marketplaces and reseller sites. It is the perfect choice for e-commerce merchants, as it has the ability to easily integrate with various shopping cart platforms.