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.
Hoteldruid is designed to manage weekly or daily rental of house apartments or hotel rooms. It uses a PostgreSQL, MySQL, or SQLite database as a backend. Reservations can be assigned to rooms automatically with user-defined rules. Pages with forms to check availability for Internet sites can be created. It supports multiple users with a privileges system. Documents and invoices can be printed, saved, and emailed.
Fisterra is a GNOME development framework for implementing business management applications or ad hoc ERPs. Fisterra 2 is comprised of fisterra-base, a mature GNOME development framework, and fisterra-distribution, a vertical solution for the retail sector, with a beta POS (Point-Of-Sale). Its CORBA middleware allows the integration of Fisterra based applications with any other free or private systems.
Dolibarr is a simple Web application with ERP and CRM capabilities. It is designed for small and medium companies, freelancers or foundations, and can be used to deal with all things you require to manage your activities, such as management of products, stocks, commercial proposals, invoices, orders, members of a foundation, and mailings. A single executable that installs the server and database is available for people with no technical knowledge.
Cream is a multilingual customer relationship management (CRM) system for media organizations. The application tracks sales orders, payments, shipments, services, online and print subscriptions, and the effectiveness of promotional campaigns through its easy-to-use reporting and analytical functions. Cream features a powerful module for communication with customers, including incoming and outgoing email, template-based HTML newsletters, and a WYSIWYG editor.