Compiere is an integrated ERP and CRM business solution for automating financial, distribution, sales, and service processes, including: financial management, purchasing, materials management, manufacturing, order management, project accounting, customer management, sales, service requests, ecommerce, reporting, and performance management. Compiere utilizes a powerful model-driven application platform that provides customers with unprecedented adaptability, rapid deployment, and low cost of ownership.
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.
Zephyr Basecamp is a functioning GTK frontend and PostgreSQL backend enterprise project that gives small and midsize businesses the same level of inventory, order entry, sales tracking, and accounting functionality as would be expected from commercial applications. It has interfaces for both X11/GNOME/Linux and Windows.