SugarCRM

Sugar Open Source enables sales, marketing, and support
organizations to manage their customer interactions more
efficiently and profitably and is intended for both large and small companies worldwide. Platform agnostic, Sugar Open Source is the least complex, most portable, and most cost-efficient customer relationship management (CRM) solution. Natively built on the LAMP (Linux, Apache, MySQL and PHP) stack, Sugar Open Source can be deployed in virtually any environment.

CRM is a mature and cost-effective endeavor, but traditional, proprietary applications are still expensive to buy or rent. It's not because it's costly to build great CRM applications, but because those who provide proprietary CRM are required to market and sell them. When you build a commercial grade CRM application based on the combined ideas and resources from CRM developers across the globe, you simply produce a better, more revolutionary product than any proprietary software or hosting company can think-up and build on its own. We believe the SugarCRM open source business model is far more efficient than the classic approach to building proprietary CRM software. We do not believe in the notion of hiding access to code in order to lock-in customers.