OpenMFG
OpenMFG (usually abbreviated "OMFG") is an open source based, fully integrated accounting, ERP, and CRM enterprise software solution, from xTuple. Built with the open source PostgreSQL database, and the open source Qt framework from Trolltech for C++, it provides functionality for a range of businesses and industries. It includes the following modules: OpenMFG runs on Windows, Linux, and Mac - and is internationalized (multi-currency, support for multiple tax structures, and multilingual translation packs maintained by a global community). OpenMFG is licensed under the "xTuple Commercial End User License". Overview. OpenMFG is a manufacturing-centric enterprise resource planning solution which  includes functionality to cover business processes for multiple manufacturing segments, customer relationship management, and accounting. The company utilizes open source technologies, and an open source development philosophy to offer its customers a hybrid open source/proprietary solution. The OpenMFG Community (customers, VARs, development partners), all get the source code and have the ability to contribute back to the base application. Technology. The two tier design of the OpenMFG intentionally places the burden of transaction processing on the server - specifically the database server. All the business logic resides in the procedural language of the open source database PostgreSQL, allowing for a  variety of client interfaces and scalability unbound by client-side limitations. The primary interface today is a full, rich graphical user interface (GUI) client - this allows for a client that looks and feels exactly the same on Windows, Linux/Unix, and Mac. OpenMFG GUI Client. The GUI client is written in Qt, from Trolltech, headquartered in Norway. Qt is a C++ toolkit for application development. It lets application developers target all major operating systems (Windows, Linux/Unix, Mac) with a single application source code. Qt provides a platform-independent API to all central platform functionality: GUI, database access, networking, file  handling, etc. The Qt library encapsulates the different APIs of different operating systems, providing the application programmer with a single, common API for all operating systems. The native C APIs are encapsulated in a set of object-oriented C++ classes. OpenMFG Server/Business Logic. The OpenMFG application make heavy use of Postgres' embedded procedural language, called PL/pgSQL. Whenever any kind of transaction is taking place in the system - a financial account being credited or debited, a piece of inventory being moved, or an order being taken - that is happening in a Postgres stored procedure, trigger, or function. This approach  makes it relatively easy for other client software besides the OpenMFG graphical client to access business functionality. xTuple partners and customers have developed various alternative interfaces to access the Postgres backend database, including Web portals, wireless devices, and desktop office productivity software.