The Apache Open For Business Project is an enterprise automation software project that includes ERP, CRM, E-Business/E-Commerce, SCM, MRP, and CMMS/EAM functions. It is a foundation and starting point for enterprise solutions and can certainly be used out of the box, but is also great for creating specialized applications.
EPESI is a Web application for managing business information. It allows you to store, organize, process, link, and share records between people within a single company or organization. Standard features include a shared calendar, tasks, and address book, an integrated Roundcube e-mail client, an advanced permission system, easy form filling (Click2Fill), record change tracking (Watchdog), and full record history. Its modular design can be easily customized and modified to match your processes and workflow. The EPESI framework allows rapid development of custom modules and extension of the functionality of the basic CRM package into full ERP applications.