Open Source ERP - Few offerings by community

Open for Business

The Apache Open For Business Project is an open source enterprise automation software project licensed under the Apache License Version 2.0. Several ERP systems are based on OfBiz, including Neogia , OpenTaps etc.

OpenBravo

Openbravo is an open source ERP solution designed specifically for the SME (small to midsize Enterprises). Developed in a web based environment.

TinyERP

Tiny ERP is a free ERP and CRM solution. The main technical features are: a GTK2 client and web interface, a distributed server,flexible workflows, an object database (on top of PostgreSQL), dynamic GUIs, customizable reports, SOAP and XML-RPC interfaces.

PostBooks

PostBooks is a full-featured, fully-integrated accounting, ERP, and CRM system, based on OpenMFG ERP Suite. Built with the open source PostgreSQL database, and the open source Qt framework for C++.

CK-ERP

CK-ERP is an open source accounting / MRP / ERP / CRM system that runs on top of multiple middlewares. It provides accounting and back office functionalities to SMEs and utilizes the underlying middleware to administer accounts/groups.

What is open source

Is a set of principles and practices on how to write software, the most important of which is that the source code is openly available. The Open Source Definition, which was created by Bruce Perens and Eric Raymond and is currently maintained by the Open Source Initiative, adds additional meaning to the term: one should not only get the source code but also have the right to use it. If the latter is denied the license is categorized as a shared source license.

Courtesy: wikipedia